Famous p0172

Hey so i got the check engine light on the truck and getting the p0172. I replaced both o2 sensors plus MAF plus aie filter and pcv valve everything oem.. and no luck. Tought it was a leaking injector but i get too rich on all the spark plugs. All of them has carbon build up from excess of gas. Adding screenshots or what readings i got on live dat. Couod be a gas regulator gone bad?

 

Looks like your current code is for the Secondary Air Injection System Pressure Sensor, all the the other codes are Permanent codes. You can't clear Permanent codes, they will clear on their own after the monitors run and pass several times.




Fuel trims don't look terrible in that capture (-14% Total), what are they at idle?

Do you have a stock intake?

 

Heyy yes. Its all stock. But im still getting too rich and the spark plugs had carbon build up.

 

And i am having problems with the secondary air pump. I replace the fuse and no luck it dosnt run. And i bypass it with 2 wires straight from the battery to its connector and got it running. Dont know what else to check.

 

That plug looks normal to me.

Has the rich code came back as a current or pending code or is it just showing as a permanent code?

It's not gona run if the pressure sensor circuit is open, need to check the wiring to the pressure sensor.

 

Where do i check that?

 

Great thanks ill check that one. I tried blowing it but it dosnt seem it has any hole. And the codes im getting are this.

 

I'd start by unplugging the pressure sensor and checking for 5v in pin #3.
That's the easiest thing to do. And would be my step 1.

 

Well we need to address the heater circuit codes before going after the rich code because the sensors won't function properly if the heaters in them aren't working.

Were those sensors OEM from a dealer and not "OEM" from Amazon/Ebay?

 

Brand new from the toyota dealer. Tought that heater sensor would be the excess of fuel.

 

No the heater heats up the sensor so it can function properly, an O2 sensor has to be around 750F before it will produce a reliable signal.

First thing is to check for power at the O2 Sensor connector on Pin 2 (Blue/White) with the key on.

 

Ok tomorrow ill try that with a voltimeter. Not to expert with electricity but ill take pictures.

Thats the temperature of the catalityc.

 

Just be careful to not shove the meter probes into the connector an spread the terminals.

 

Is there any way to test the terminal to power up the secondaey air pump to see if the wiring is working?

 

You need to address the Air Pressure Sensor circuit first before worrying about the pump.

First check if you have 5v between Pin 1 (Brown) and Pin 3 (Blue) of the Air Pressure Sensor connector with the key on.

 

Ok im on my way with tye tester.

 

Ok im checking but i dont know where to set the voltimeter. Lol im not to good with electricity.

 

Ok so i did the test and it does shows 4.99 volts with those two cables whats the next step