4xfletch

Hello all,
CEL is putting out the usual group of codes: p1133 p1135 p0125
So I replace B1S1 Fuel/ratio sensor with denso
MAF
Temp sensor
Upstream CAT (I know it prob doesn't effect these codes but it was rattling)
Ran a tank with Lucas fuel system cleaner.

Still have the CEL.
So I take it the dealership who has it for 5 days before finally returning my calls. They say they want to replace all the sensors again and re-do the entire exhaust before they can determine anything. So I'm taking it back.

Anyone have these same codes still showing up after replacing the usual causes? I have ran searches but they all lead to the same handful of repairs and I have tried all of those.

fastnoypi

consider looking at your B1S1 sensor again and check for anti-seize on the tip or a pulled frayed wire. These things can happen upon installation. Also check/clean for any dirt that may be interfering with the contact connections in plug and wire harness.

4xfletch

I will check the plug for dirt. Thanks for the idea.
I should also say that I bought another A/F sensor and put in it and put the first one in the front just to ensure I did not get a bad sensor somehow.

maxSteel

One cause of P0125 is gas leakage on the exhaust system.
Why is the cat rattling?

Z07

Did you put it on any type of scanner to see what the ECM is being told by the ECT sensor? And you can watch the O2 sensors go rich then lean and the cat monitoring O2 sensor go rich and lean slower at a smaller magnitude.

I would want to see what the computer is seeing before I swapped another part.