Re: How many O2 sensors...?

Question

I am pretty sure that your Corolla has two O2 sensors.  The O2 sensor located after the catalytic converter (known as sensor #2) does not have any effect on fuel economy or engine performance.  The purpose of sensor #2 is to monitor O2 in the exhaust after it has passed through the catalytic converter and compare it with the O2 that sensor #1 is monitoring.  If they are the same, then the catalytic converter is not working properly and the engine computer illuminates a check engine light.

Tegger · Accepted Answer

"Ray O"  wrote innews:giorq4$3rt$     In a '93?I thought that started with the '96 model year for the Corolla.I'm pretty sure Sarah has just one sensor, that being upstream of the cat (in the exhaust manifold).

Ray O · Answer

Yup, my bad, it looks like 93 Corollas had to have CA emissions in order to have the after-cat sensor.

Tegger · Answer

"Ray O"  wrote innews:gip3k9$q1e$     That would have been OBD-I (originally called simply "OBD").OBD was the immediate precursor to OBD-II, being installed on CA vehicles from 1988 to about 1995. OBD was sort of a test-bed for the nationwide OBD-II system that became federally mandatory from the 1996 model year.All pre-'96 Corollas retained single sensors if they were not equipped with CA-compliant OBD.

Sarah Houston · Answer

That's the easy one to spot.No, Colorado.

Sarah Houston · Answer

I think it has to do with the angle of hills too.

I know when I try to start up a hill with the FWD, if there's ice, the wheels just spin. Then if I can turn the car around and back up ( assuming it's a short distance to the street above ) it works fine.

Re: How many O2 sensors...?

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