Originally Posted by pioneer4x4

Maybe the air pump is running when it shouldn't and that would cause a lean code, correct? You might have found a cause. Before you pulled the fuse, could you hear it running after initial warm-up?

Originally Posted by pioneer4x4

Maybe the air pump is running when it shouldn't and that would cause a lean code, correct? You might have found a cause. Before you pulled the fuse, could you hear it running after initial warm-up?

Originally Posted by maxcichon

Yeah, it should only run until the coolant temp gets up a little bit, then shut off.

Originally Posted by waldig

Originally Posted by jgreen

I am not sure what to listen for do you know the location of th pump?

The engine light came on again this morning. I will run the code to see if it's just posting P0410 error. I'll upload the results later tonight.

Thanks pioneer4x4 for your reply

Originally Posted by maxcichon

Front, center, top of the engine. It has a lifting ring cast into it.

Originally Posted by pioneer4x4

And when I first heard mine, I thought something was wrong, it is a pretty noticeable sound.

Originally Posted by pizzaguy

Yea, you can't miss the sound. With the fuse pulled, the car will generate a P0410 or P0401 code (can't remember which and I'm too tired to look).

If that pump runs when it shouldn't, then yes, the O2 sensors are going to see stuff they should not.

Originally Posted by jgreen

Just a thought.... When the O2 sensors were replaced could they have plugged them in backwards. Bank 1 Sensor 1 is plugged into Bank 1 Sensor 2 on the PCM?

Originally Posted by pioneer4x4

Ooooh, if that is it, that would be a great call, it does sound like it could cause his odd readings. I'd have to look and see if the wiring is close enough to reach, have you?

Originally Posted by pioneer4x4

Ooooh, if that is it, that would be a great call, it does sound like it could cause his odd readings. I'd have to look and see if the wiring is close enough to reach, have you?

Originally Posted by jgreen

I am not exactly sure where to look. I looked at the wiring schematic in the service manual but, not sure where to look under the hood.

Could you snap a pic of your 02 sensors connecting into the PCM. I will verify mine matches the same color code.

Originally Posted by pioneer4x4

Does this help?



And I don't know what color WL is, According to the Service Manual the only thing close is "WT" for White
BR = Brown
DG = Dark Green
YL\BK = Yellow & Black...

Originally Posted by pioneer4x4

At time 377.2, notice how both bank 1 O2 sensors go to 0V, you might have a ground issue, or a short to ground issue. Just a guess, but I have seen an engine harness rub through and cause issues only under full access when it rubbed a certain way, but looked fine under the hood parked.
A weird ground issue may also explain the other sensor going weird. But as you mentioned Bluetooth OBD2 isn't perfect either.

Originally Posted by waldig

You can swap the connectors on the upper o2 sensors, takes some effort to reach. I did it to test something out and it made richer readings but it did run. WW