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Is mechanic right? CEL - P0430

Discussion in '2nd Gen. Tacomas (2005-2015)' started by LilTuffGirl, Jan 18, 2012.

  1. Jan 18, 2012 at 2:07 AM
    #1
    LilTuffGirl

    LilTuffGirl [OP] Well-Known Member

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    He said it was O2 sensor but didn't know which on since it just said "430" as he said. I did a little searching and am guessing that's p0430.

    He took out the lower sensor since it was an easy thing to do and said he was going to check for swelling. He said it looked fine and was probably the upper.

    No idea if he reset the light but it's off now....

    Truck does idle rough... light goes on and off but has been staying on longer now. To me it does act like an 02 sensor issue. Just want to make sure his educated guess to being the top one sounds correct? Truck has over 130k on it.

    BTW this is our county garage mechanic. He works on fords and chevys all day.. Does a lot of side jobs but have heard he can be shady at times.
     
  2. Jan 18, 2012 at 2:10 AM
    #2
    Tigahshark

    Tigahshark Senior NEWBIE

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    Kinda sketchy
     
  3. Jan 18, 2012 at 4:14 AM
    #3
    jbrenn

    jbrenn Well-Known Member

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    if you have an autozone in your area next time the light is on take it to them they can read the code for free. other part stores may have this ability but i dont know.
     
  4. Jan 18, 2012 at 4:49 AM
    #4
    Rusty 06 4x4

    Rusty 06 4x4 NBHNC

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    yep advance and i am sure o'reillys does too
     
  5. Jan 18, 2012 at 4:53 AM
    #5
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    stock, for now
    I think they suggest you replace them at 100k regardless
     
  6. Jan 18, 2012 at 5:00 AM
    #6
    DOUBLLD

    DOUBLLD Well-Known Member

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    Swelling lol all I have to say wtf. You can't check a o2 sensor like that. That code is for bank 2 cat which is the driverside. I'm a Toyota tech. In a rare case the lower a/f sensor would set a cat code so u could try that first since it is cheaper. Let me know how it goes
     
  7. Jan 20, 2012 at 8:15 PM
    #7
    LilTuffGirl

    LilTuffGirl [OP] Well-Known Member

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    Auto zone's sucks.. it gives you general area.. I did go there first and they said exhaust/air...

    I still have to ask him if he reset my light.. it's still off after the "cleaned" the bottom sensor.. it may be that one if he didn't reset the light. It's been running smooth again.
     
  8. Jan 20, 2012 at 8:55 PM
    #8
    joes06tacoma

    joes06tacoma Well-Known Member

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    I'm no pro at this but here's my two cents. That's the code for "catalytic converter inefficiency". The PCM compares the 02 content of the exhaust before and after the converter. The upstream sensor is also used to adjust the fuel mixture. Even if the upstream sensor was bad and the PCM was setting the mixture wrong, there still should be a difference in readings between the two sensors. Most likely, the Cat itself is bad. The way to check it would be with an exhaust gas analyzer like what's used to smog check an engine. Pull both 02 sensors and "sniff" the holes where the sensors install.

    The way I see it, if you're gonna blame the sensor, you should do that only after you confirm the cat is doing what it's supposed to do.

    My sister just had this happen on her CRV. Same fault code. Her mechanic changed the cat and the problem went away.
     
  9. Jan 20, 2012 at 10:18 PM
    #9
    memario1214

    memario1214 Vivid Illumination Vendor

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    Yeah, I gots boost
    I really don't think that the p0420 or 0430 codes could attribute to the truck riding rough :notsure:... I have both of those codes for reasons I created and my truck never rides rough. Just makes me think that something else may be going on
     
  10. Jan 21, 2012 at 7:58 AM
    #10
    DOUBLLD

    DOUBLLD Well-Known Member

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    I would say run rough yes. A clogged cat will make it run very rough an sometimes won't run at all trust me I've seen it a few times.
     
  11. Jan 21, 2012 at 5:56 PM
    #11
    LilTuffGirl

    LilTuffGirl [OP] Well-Known Member

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    Yea it was just at idle it would run a bit rough...

    but it's fine now?
     
  12. Jan 22, 2012 at 10:51 PM
    #12
    the.sight.picture

    the.sight.picture Well-Known Member

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    Ok , the following post contains the FACTORY mechanics service manual on this code. I fixed mine with 02 sensors from amazon. make sure they are denso. sorry its long
    1GR-FE ENGINE CONTROL SYSTEM ​
    – SFI SYSTEM ES–209

    ES​
    MONITOR DESCRIPTION​
    The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to
    monitor its efficiency.
    The first sensor, the Air-Fuel Ratio (A/F) sensor, sends pre-catalyst information to the ECM. The second
    sensor, the Heated Oxygen (HO2) sensor, sends post-catalyst information to the ECM.
    In order to detect any deterioration in the TWC, the ECM calculates the Oxygen Storage Capacity (OSC)
    of the TWC. This calculation is based on the voltage output of the HO2 sensor while performing active airfuel
    ratio control, rather than the conventional detecting method, which uses the locus ratio.
    The OSC value is an indication of the oxygen storage capacity of the TWC. When the vehicle is being
    driven with a warm engine, active air-fuel ratio control is performed for approximately 15 to 20 seconds.
    When it is performed, the ECM deliberately sets the air-fuel ratio to lean or rich levels. If a rich-lean cycle
    of the HO2 sensor is long, the OSC becomes greater. There is a direct correlation between the OSCs of
    the HO2 sensor and the TWC.
    The ECM uses the OSC value to determine the state of the TWC. If any deterioration has occurred, it
    illuminates the MIL and sets a DTC.
    HINT:
    • Bank 1 refers to the bank that includes cylinder No. 1.
    • Bank 2 refers to the bank that does not include cylinder No. 1.
    • Sensor 1 refers to the sensor closest to the engine assembly.
    • Sensor 2 refers to the sensor farthest away from the engine assembly.​
    MONITOR STRATEGY​
    DTC P0420 Catalyst System Efficiency Below Threshold
    (Bank 1)
    DTC P0430 Catalyst System Efficiency Below Threshold
    (Bank 2)​
    DTC No. DTC Detection Conditions Trouble Areas​
    P0420 OSC value smaller than standard value under active air-fuel
    ratio control (2 trip detection logic)
    • Gas leakage from exhaust system
    • A/F sensor (bank 1 sensor 1)
    • HO2 sensor (bank 1 sensor 2)
    • Exhaust manifold (TWC)
    P0430 OSC value smaller than standard value under active air-fuel
    ratio control (2 trip detection logic)
    • Gas leakage from exhaust system
    • A/F sensor (bank 2 sensor 1)
    • HO2 sensor (bank 2 sensor 2)
    • Exhaust manifold (TWC)
    Related DTCs P0420: Catalyst Deterioration
    P0430: Catalyst Deterioration
    Required Sensors/Components (Main) A/F sensor and heated oxygen sensor
    Required Sensors/Components (Related) Intake air temperature sensor, mass air flow meter, crankshaft position sensor and
    engine coolant temperature sensor
    Frequency of Operation Once per driving cycle
    Duration 30 seconds or more
    MIL Operation 2 driving cycles
    Sequence of Operation None​
    ES–210 ​
    1GR-FE ENGINE CONTROL SYSTEM
    – SFI SYSTEM

    ES​
    TYPICAL ENABLING CONDITIONS
    TYPICAL MALFUNCTION THRESHOLDS
    MONITOR RESULT​
    Detailed information on Checking Monitor Status (See page ​
    ES-19).

    CONDITIONING FOR SENSOR TESTING​
    HINT:
    Perform the operation with the engine speeds and time durations described below prior to checking the
    waveforms of the A/F and HO2 sensors. This is in order to activate the sensors sufficiently to obtain the
    appropriate inspection results.​
    Monitor runs whenever following DTCs not present
    P0011 (VVT System 1 - Advance)
    P0012 (VVT System 1 - Retard)
    P0021 (VVT System 2 - Advance)
    P0022 (VVT System 2 - Retard)
    P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
    P0037, P0038, P0057, P0058 (HO2 sensor Heater - Sensor 2)
    P0100 - P0103 (MAF meter)
    P0115 - P0118 (ECT sensor)
    P0120 - P0223, P2135 (TP sensor)
    P0125 (Insufficient ECT for closed loop)
    P0136, P0156 (HO2 Sensor - Sensor 2)
    P0171, P0172 (Fuel system)
    P0300 - P0306 (Misfire)
    P0335 (CKP sensor)
    P0340 (CMP sensor)
    P0351 - P0356 (Ignitor)
    P0500 (VSS)
    P2196, P2198 (A/F sensor - rationality)
    P2A00, P2A03 (A/F sensor - slow response)
    Battery voltage 11 V or more
    IAT -10​
    °C (14°F) or more
    Engine coolant temperature sensor 75
    °C (167°F) or more
    Atmospheric pressure coefficient 0.75 or more
    Delay time after IDCE ON Less than 5 seconds
    Engine RPM Less than 3,200 rpm
    A/F sensor status Activated
    Fuel system status Closed loop
    Delay time after fuel cut 10 seconds or more
    Engine load 10 to 70 %
    All of the following conditions are met Condition 1, 2 and 3
    1. Mass air flow rate 5 to 70 g/sec
    2. Front catalyst temperature (estimated) 650 to 840
    °C (1,202 to 1,544°F)
    3. Rear catalyst temperature (estimated) 100 to 900
    °C (212 to 1,652°F)
    Oxygen Storage Capacity (OSC) of Three-Way Catalytic Converter (TWC) Less than 0.04 g

    1GR-FE ENGINE CONTROL SYSTEM ​
    – SFI SYSTEM ES–211

    ES​
    (a) Connect an intelligent tester to the DLC3.
    (b) Start the engine and warm it up with all the accessories switched OFF, until the engine coolant
    temperature stabilizes.
    (c) Run the engine at an engine speed of between 2,500 rpm and 3,000 rpm for at least 3 minutes.
    (d) While running the engine at 3,000 rpm for 2 seconds and 2,000 rpm for 2 seconds, check the
    waveforms of the A/F and HO2 sensors using the tester.
    HINT:
    • If either of the voltage outputs of the Air-Fuel Ratio (A/F) or Heated Oxygen (HO2) sensor does not
    fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.
    • If the voltage outputs of both the sensors remain lean or rich, the air-fuel ratio may be extremely lean or
    rich. In such cases, perform the following A/F CONTROL using an intelligent tester.
    • If the Three-Way Catalytic Converter (TWC) has deteriorated, the HO2 sensor (located behind the
    TWC) voltage output fluctuates up and down frequently, even under normal driving conditions (active
    air-fuel ratio control is not performed).​
    (c)
    Engine Speed
    3,000 rpm
    2,000 rpm
    Idling
    Ignition Switch OFF
    (a)
    (b)
    (d)
    (d)
    Warming up At least 3 minutes
    2 seconds
    Check
    Time​
    A118003E01​
    ES–212 ​
    1GR-FE ENGINE CONTROL SYSTEM
    – SFI SYSTEM

    ES​
    CONDITIONING FOR SENSOR TESTING​
    HINT:
    Intelligent tester only:
    Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
    TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated
    Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
    The following instructions describe how to conduct the A/F CONTROL operation using an intelligent
    tester.
    (1) Connect an intelligent tester to the DLC3.
    (2) Start the engine and turn the tester ON.
    (3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
    (4) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
    (5) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT
    button to change the fuel injection volume).
    (6) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and
    O2S B2S2) displayed on the tester.
    HINT:
    • The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection
    volume by 25 %.
    • Each sensor reacts in accordance with increases and decreases in the fuel injection volume.​
    Standard​
    Tester Display
    (Sensor) Injection Volumes Status Voltages
    AFS B1S1 or AFS B2S1
    (A/F) +25 % Rich Less than 3.0
    AFS B1S1 or AFS B2S1
    (A/F) -12.5 % Lean More than 3.35
    O2S B1S2 or O2S B2S2
    (HO2) +25 % Rich More than 0.55
    O2S B1S2 or O2S B2S2
    (HO2) -12.5 % Lean Less than 0.4​
    Voltage output when active air-fuel ratio control not performed
    Normal Catalyst Deteriorated Catalyst
    Waveform of
    HO2 Sensor
    behind TWC
    Waveform of
    A/F Sensor in
    front of TWC
    3.5 V
    3.0 V
    1.0 V
    0 V
    10 seconds 10 seconds​
    A121610E01​
    1GR-FE ENGINE CONTROL SYSTEM ​
    – SFI SYSTEM ES–213

    ES​
    NOTICE:
    The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen
    (HO2) sensor has a maximum output delay of approximately 20 seconds.​
    • Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
    both the A/F and HO2 sensors.
    • To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II
    / ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S
    B2S2, and press the YES button and then the ENTER button followed by the F4 button.
    HINT:
    Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when
    malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
    moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
    data, from the time the malfunction occurred.
    (a) Connect an intelligent tester to the DLC3.
    (b) Turn the ignition switch ON and turn the tester ON.
    (c) Select the following menu items: DIAGNOSIS /
    ENHANCED OBD II / DTC INFO / CURRENT CODES.
    (d) Read DTCs.​
    Result​
    Case A/F Sensor (Sensor 1)
    Output Voltage
    HO2 Sensor (Sensor 2)
    Output Voltage
    Main Suspected
    Trouble Areas​
    1
    Injection volume
    +25 %
    -12.5 %
    Injection volume
    +25 %
    -12.5 %
    -
    Output voltage
    More than 3.35 V
    Less than 3.0 V
    Output voltage
    More than 0.55 V
    Less than 0.4 V
    2
    Injection volume
    +25 %
    -12.5 %
    Injection volume
    +25 %
    -12.5 % • A/F sensor
    • A/F sensor heater
    Output voltage • A/F sensor circuit
    Almost
    no reaction
    Output voltage
    More than 0.55 V
    Less than 0.4 V
    3
    Injection volume
    +25 %
    -12.5 %
    Injection volume
    +25 %
    -12.5 % • HO2 sensor
    • HO2 sensor heater
    Output voltage • HO2 sensor circuit
    More than 3.35 V
    Less than 3.0 V
    Output voltage
    Almost
    no reaction
    4
    Injection volume
    +25 %
    -12.5 %
    Injection volume
    +25 %
    -12.5 %
    • Injector
    • Fuel pressure
    • Gas leakage from
    exhaust system
    (Air-fuel ratio extremely
    lean or rich)
    Output voltage
    Almost
    no reaction
    Output voltage
    Almost
    no reaction​
    1 ​
    CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430)

    Display (DTC Output) Proceed To
    P0420 and/or P0430 A​
    ES–214 ​
    1GR-FE ENGINE CONTROL SYSTEM
    – SFI SYSTEM

    ES​
    HINT:
    If any DTCs other than P0420 or P0430 are output,
    troubleshoot those DTCs first.​
    B
    A​
    (a) Connect an intelligent tester to the DLC3.
    (b) Start the engine and turn the tester ON.
    (c) Warm up the engine at an engine speed of 2,500 rpm for
    approximately 90 seconds.
    (d) Select the following menu items: DIAGNOSIS /
    ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
    (e) Perform the A/F CONTROL operation with the engine in
    an idling condition (press the RIGHT or LEFT button to
    change the fuel injection volume).
    (f) Monitor the voltage outputs of the A/F and HO2 sensors
    (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S
    B2S2) displayed on the tester.
    HINT:
    • The A/F CONTROL operation lowers the fuel injection
    volume by 12.5 % or increases the injection volume
    by 25 %.
    • Each sensor reacts in accordance with increases and
    decreases in the fuel injection volume.​
    Standard
    Result​
    P0420 and/or P0430 and other DTCs B
    Display (DTC Output) Proceed To​
    GO TO DTC CHART​
    2 ​
    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (A/F CONTROL)

    Tester Display
    (Sensor) Injection Volumes Status Voltages
    AFS B1S1 or AFS B2S1
    (A/F) +25 % Rich Less than 3.0
    AFS B1S1 or AFS B2S1
    (A/F) -12.5 % Lean More than 3.35
    O2S B1S2 or O2S B2S2
    (HO2) +25 % Rich More than 0.55
    O2S B1S2 or O2S B2S2
    (HO2) -12.5 % Lean Less than 0.4
    Status
    AFS B1S1
    or
    AFS B2S1
    Status
    O2S B1S2
    or
    O2S B2S2
    A/F Condition and A/F and
    HO2 Sensors Conditions Misfires Main Suspected Trouble Areas Proceed
    To
    Lean/Rich Lean/Rich Normal - • Three-Way Catalytic Converter (TWC)
    • Gas leakage from exhaust system A
    Lean Lean/Rich A/F sensor malfunction - • A/F sensor
    B
    Rich Lean/Rich A/F sensor malfunction - • A/F sensor
    Lean/Rich Lean HO2 sensor malfunction - • HO2 sensor
    • Gas leakage from exhaust system
    C
    Lean/Rich Rich HO2 sensor malfunction - • HO2 sensor
    • Gas leakage from exhaust system​
    1GR-FE ENGINE CONTROL SYSTEM ​
    – SFI SYSTEM ES–215

    ES​
    Lean: During A/F CONTROL, the A/F sensor output
    voltage (AFS) is consistently more than 3.35 V, and
    the HO2 sensor output voltage (O2S) is consistently
    less than 0.4 V.
    Rich: During A/F CONTROL, the AFS is consistently
    less than 3.0 V, and the O2S is consistently more than
    0.55 V.
    Lean/Rich: During A/F CONTROL of the ACTIVE
    TEST, the output voltage of the HO2 sensor
    alternates correctly.​
    B
    C
    A
    OK:
    No gas leakage.
    NG
    OK​
    Lean Lean Actual air-fuel ratio lean May occur
    • Extremely rich or lean actual air-fuel
    ratio
    • Gas leakage from exhaust system
    A
    Rich Rich Actual air-fuel ratio rich -
    • Extremely rich or lean actual air-fuel
    ratio
    • Gas leakage from exhaust system
    Status
    AFS B1S1
    or
    AFS B2S1
    Status
    O2S B1S2
    or
    O2S B2S2
    A/F Condition and A/F and
    HO2 Sensors Conditions Misfires Main Suspected Trouble Areas Proceed
    To​
    CHECK AND REPLACE AIR FUEL RATIO
    SENSOR
    CHECK AND REPLACE HEATED OXYGEN
    SENSOR, AND CHECK AND REPAIR
    EXHAUST GAS LEAKAGE​
    3 ​
    CHECK FOR EXHAUST GAS LEAKAGE
    REPAIR OR REPLACE EXHAUST GAS
    LEAKAGE POINT

    REPLACE THREE-WAY CATALYTIC CONVERTER
     
  13. Jan 22, 2012 at 10:52 PM
    #13
    the.sight.picture

    the.sight.picture Well-Known Member

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    Tint
    print that out and take it to him
     
  14. Jan 24, 2012 at 9:35 AM
    #14
    DOUBLLD

    DOUBLLD Well-Known Member

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    icon lift, total chaos control arms. ls swap twin turbo in progress.
    Y'all are over complicating things. It's a cat code. If it becomes clogged it will run rough and if u replace the cat it's a good idea to do the sensors at the same time because they have been getting bad readings for a while. An you have to remove them anyway to do the cat
     
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