Bank 1 Sensor 2 Failed Inspection

Ok experts, does anyone have a diagram of the various o2 sensors on my truck (where each is located) I know bank 1 is drivers side sensor 2 should be downstream correct.

Just want to know where it is located on a diagram.

03 Tacoma, TRD, 6 cyl, 4x4

 

It is the one after the Cat. It is either bad or the Cat is bad.

 

Ok, thx for the response... is there a way of determining if it is one or the other? Also I was told bank 1 was the drivers side but on my 03 the cat is on the passenger side and the 02 is just downstream from it. so what does bank stand for?

 

any check engine lights?? usually its a p0420 code

 

Bank is a simple way of saying roughly where the O2 sensor is. "Bank" would refer to a "river bank" and your exhaust flow is the "water" and the sensor would be on the "bank". Bank one would be the nearest to the engine and bank two would be the furthest.

 

Yes the code is P0136.

Thank you for that info Hondah, I replaced bank 1 sensor 1 already and the light was off for a while but it recently came back on and now gives the above code and says bank 1 sensor 2

 

I just found this helpful info....

Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine

It's not correct to simply state that driver's side is always cylinder #1 or vice versa. Even on cars with a tranverse mounted engine, bank #1 is referring to downstream from the side of the engine with cylinder #1.

P0136 OBD-II Trouble Code
Technical Description
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

What does that mean?
Essentially the same as P0137, a P0136 code refers to the second oxygen sensor on Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich.

O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulse width according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)

Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.

Causes
A code P0136 may mean that one or more of the following has happened:

• Faulty O2 sensor leak in exhaust close to O2 sensor
• Short to voltage on O2 signal circuit
• Open in circuit resistance caused by corrosion in connector

Possible Solutions

• Replace the second oxygen sensor on bank 1
• Repair open or short in signal circuit
• Clean corrosion from connector

 

Ok So I went to the dealer and verified that there are only two o2 sensors on my 03 Tacoma Front(upstream) and Rear(downstream)

Toyotas cost for the Bank 1 Sensor 2 (downstream, Passenger side, near cat) is $176.96 the same exact part from RockAuto is $52.89 + $5.62 Shipping, as always a huge savings...

Thx for everyone's help

 

Just make sure if yours is a 3 wire or a 4 wire. Try and get a Denso to replace it as others have had problems with aftermarket sensors.

Use this:
http://www.toyodiy.com/parts/

And "I" use them:
http://www.toyotaonlineparts.com/

Have fun.

 

Yes it is a denso which is OEM