Altima 97 with yellow engine light on

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a - 04 Dec 2005 17:28 GMT

I have an Altima 97 with 19k miles on. Recently, the yellow engine light
came on. I borrowed an electronic code reader which indicated that there was
a problem with an oxygen sensor. Then the light went out by itself, so I
thought this was just a glitch, but it came back on. Any ideas what this may
be caused by? If it is indeed an oxygen sensor, is it something I can fix
myself or do I need to take it to a shop? BTW, I don't know if this is
relevant, but the car passed the smog check a few months ago.

Thanks,

A

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Gordon reeder - 08 Dec 2005 05:27 GMT

> I have an Altima 97 with 19k miles on. Recently, the yellow engine
> light came on. I borrowed an electronic code reader which indicated
[quoted text clipped - 8 lines]
>
> A

Sounds like mine.
There are two O2 sensors one before the cat converter and one after.
The scan tool should have told you which one was bad. I can also
read the sensor to tell if it is currently working. With the O2
sensor in-op the car will run in open loop mode. You may notice a
performance difference (mine pings).

Replacing the O2 sensor is relitivly easy. You will find it
stuck into the tail pipe just before of after the Cat converter.
Before you replace it, try cleaning the connector contacts.

As for the light going out. It will go out if no trouble is
detected for six consecutive trips.

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a - 08 Dec 2005 16:33 GMT

Thanks for your reply.

> Sounds like mine.
> There are two O2 sensors one before the cat converter and one after.
> The scan tool should have told you which one was bad.

I think it was the O1 sensor.

> Replacing the O2 sensor is relitivly easy. You will find it
> stuck into the tail pipe just before of after the Cat converter.
> Before you replace it, try cleaning the connector contacts.

Is the O1 sensor in the same place and easy to replace?

> As for the light going out. It will go out if no trouble is
> detected for six consecutive trips.

This may indicate that the sensor is not faulty, but there may be a bad
connection.

Thanks for the advice!

A

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Gordon reeder - 10 Dec 2005 05:20 GMT

"a" <xxxxxxx@pacbell.net> wrote in news:kfZlf.30113$q%.3422
@newssvr12.news.prodigy.com:

> Thanks for your reply.
>
[quoted text clipped - 3 lines]
>
> I think it was the O1 sensor.

Sorry about the confusion: O2 = Oxygen.

#1 O2 sensor is in the manifold, #2 sensor is in the tail pipe
after the cat converter.

>> Replacing the O2 sensor is relitivly easy. You will find it
>> stuck into the tail pipe just before of after the Cat converter.
[quoted text clipped - 11 lines]
>
> A

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