Re: Check engine light - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Check engine light
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Posted by Dean (more from Dean) on Mon, 21 Oct 2002 16:14:37 Share Post by Email
In Reply to: Check engine light, Ange, Mon, 21 Oct 2002 15:27:08
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The O2 sensors get their ground contact via the exhaust system, which is really dumb.

They need to measure the resistance from the O2 sensor bodies to the battery ground connect at the battery. They will want a cold engine to do this. They will need a good DMM (digital multi meter) to do this.

Resistance can be at the O2 sensor contact to the pipe, but in your case with newly seated sensor, the problem is probably not there. They can check for the resistance at the down pipe to turbo interface, turbo to manifold and manifold to block. I hate to say this, but your old O2 sensors may have been ok, and the dealer has tossed them into the trash. A CEL for an O2 sensor does not mean that the sensor is bad, it means that the senor is not working properly as installed.

When the ground problem occurs at the senor, the sensor can be backed out slightly, just enough to get some fine wet/dray sandpaper into the gap to brighten things up, then reseat. The cable does not need to be removed.

If they get a fraction of an ohm from the sensors to the ground, then the problem is one of a different nature. They might need to brighen some bits up to make the resistance measurements. I am of half a mind to run separate ground straps to the O2 sensors to eliminate this weak point.

Most sensors run well past 100000 miles with no problems. The fact that you have two sensor's at once really suggests a resistance in the exhaust system.

Print this out for your dealer.

posted by 208.24.179...

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