Contour Enthusiasts Group Archives Forums Modifications Zetec Maintenance I'm Lost (P1131 - P0171) ?? Car Shutting Off!!

Originally posted by TronX:

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The O2 simply unscrews from the exhaust manifold between the engine and the radiator.

Since this engine only has one O2 for fuel metering, there is no simple way to tell if the O2 is bad or if there is another problem affecting the mixture.

Standard procedure for this code would mean cleaning the MAF, looking for vacuum leaks, and changing the O2.

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Originally posted by Kremithefrog:

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Originally posted by TronX:

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The O2 simply unscrews from the exhaust manifold between the engine and the radiator.

Since this engine only has one O2 for fuel metering, there is no simple way to tell if the O2 is bad or if there is another problem affecting the mixture.

Standard procedure for this code would mean cleaning the MAF, looking for vacuum leaks, and changing the O2.

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There are two o2 sensors, the pic you posted is the one that goes bad (other one goes bad, but rarely).
I use www.oxygensensors.com for replacements.

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Well.. I just cleaned the connectors from that O2 sensor.
At first I didn't see any codes and the idle was good. But then after driving around again the P1131 set off and I could feel the car change slightly.

What part number am I looking for?

Dang.. and I guess I need that odd looking sensor socket.

Originally posted by Kremithefrog:

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Upstream, OEM loan the socket from autozone.

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I don't mind buying the tool for only 10$

The website you gave me does not say upstream.

"Sensor located in front manifold/exhaust pipe before catalyst"

Does "Sensor located in front manifold/exhaust pipe before catalyst" = Upstream?

1998 Mercury Mystique L4-2.0L
PN# 250-24016

Originally posted by Kremithefrog:

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yes

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Thanks Kremit!

Going to order that part and we shale see if this fixes the problem...