O2's...

[blowby]

Just replaced a leaking OPS and while I was there replaced the rear O2 sensor (replaced with bosch unit).

The OPS was not bad to replace..I removed the plastic wiring shroud on the firewal ad accessed it from the back while laying on top of the engine.
Took all of 1 hr to replace the OPS and the O2 sensor.

I was getting code 172 for a while and the car was running funny once warmed up. The O2's were both replaced approx 20k miles ago.
Anyway now the 172 code is gone but now I am getting a 136 code...Front sensor lean or not switching?...
Do you think that sensor just quit on me..seems too coincidental but maybe not.
Or do you think I have some other issue that is causing either the O2's to go bad or send out that code..but why would they not throw codes together?

Bryan

 

[blowby]

Not sure about what was happening with the 136 code.
It seem to have clear up by itself.
Love computers...

 

[SASHO91]

could have a vacuum leak.

Spray the intake with carb cleaner(lightly), and if the idle increases at anytime, you have found your leak...

 

[blowby]

Done that already...
Checked and re-checked all vac lines.
No leaks.

136 comes on occasionally now...likely a bad O2...Ill pull it and check it out.

The rear O2 that I replaced was bad...it only showed .2volts after heating it for 2 min.
Maybe I got 2 bad ones...who knows.

Bryan

 

[Mr Anonymous]

Generally codes for a single bank indicate a sensor problem. Since you've already checked for unmetered air, replacing at least that O2 sensor would be a logical next step. I personally find doing them in pairs can save some headaches later on down the road as well.

 

[SHOZ123]

Any exhaust leaks on that bank?

 

[jsj123]

Whats an OPS?