O2 Sensor (Upstream Air/Fuel) on a 2.7l (code P0135)

I plan to do a diy smoke test. We'll see what turns up.

 

For reference, here are my scan results. Not sure if your scanner gives more info.

 

Ghs57
Many years later, but did you figure out the problem? I got the same.

 

Wow, that was some time ago, and last December I sold the truck. But, for this vehicle this was the last code(s) I had to track down. Turned out to be a bad VSV valve on the evap circuit. I went around and checked them for positive function with a 9v battery. They all clicked open or closed when tested, except the one on the driver's side wheel well. I forget the particular circuit involved, but I was able to find the Denso VSV online somewhere (https://www.rockauto.com/en/moreinfo.php?pk=6313929&cc=1418442&jsn=1).

After 4 1st gens, I moved to a 2nd gen, TRD Off Road with a replaced frame. All the 1st gens had bad frames (2 buy backs, 1 replaced, and 1 out of warranty). So I had had enough of that. Already done a ton of work on the 2nd gen - suspension, brakes and a bunch of small stuff the prior owners did not fix.

 

Thanks for the reply. Appreciate it.

 

Is the green label the egr sensor?
Thanks.

 

Vacuum modulator for EGR

 

Thanks. Trying to Decipher P0401.

 

It would be helpful to add your Tacomas specs to your profile.
Then start a new thread because this one is old and all over the place repairs wise.

 

Thank you. Will do.