Bad O2 sensor with no CEL? what are the symptoms?

[rice400]

Usually if an 02 sensor is bad the car will run good cold and at wide open throttle only.

Topic

[college man]

if its the pre cat o2 the car will not know if its lean or rich.

[JDM_Hatch99]

Quoted From college man: _x000D_
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if its the pre cat o2 the car will not know if its lean or rich.

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I do believe i unplugged the pre cat o2. It was right before the cat closer tothe engine. Why did i unplug the wrong one to test?

[college man]

I would remove the o2 and drive the car. see if your_x000D_
symptoms improve.

[college man]

I would remove the o2 and drive the car. see if your_x000D_
symptoms improve.

[JDM_Hatch99]

Quoted From college man: _x000D_
_x000D_
I would remove the o2 and drive the car. see if your_x000D_
symptoms improve.

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_x000D_
Lol i did remove it. What i was asking is did i remove the correct one? read a few posts up

[dreamer2355]

You need to remove the pre-cat o2 sensor, the one closest to the exhaust manifold._x000D_
_x000D_
Is that what your asking?

[JDM_Hatch99]

Quoted From dreamer2355: _x000D_
_x000D_
You need to remove the pre-cat o2 sensor, the one closest to the exhaust manifold._x000D_
_x000D_
Is that what your asking?

_x000D_
_x000D_
Yes. _x000D_
_x000D_
Anyways after driving around a little while with it unplugged, it of course didn

[JDM_Hatch99]

Bump for clutch?

[EricTheCarGuy]

A leaking rear main seal will not effect the clutch since it’s behind the flywheel.

[JDM_Hatch99]

[quote]Quoted From EricTheCarGuy: _x000D_
_x000D_
A leaking rear main seal will not effect the clutch since it’s behind the flywheel.

[EricTheCarGuy]

Once again the oil would leak on the BACK of the flywheel away from the clutch assembly and it’s a long trip around that into the pressure plate and clutch assembly, if the transmission was leaking on to the clutch assembly that would be a different story

[Author]

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