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oxy sensor ???




My 1990 Audi 100 (2.3 liter 5 cylinder) failed emmissions due to high
NO emmissions. CO and HC were just fine.

I am suspecting the O2 sensor as it has 147K miles and the original
sensor.

My problem is, I cannot seem to find it !!???  I've looked
everywhere... from above, below and every other angle. It should be on
the exhaust manifold,  but I don't see it.

Can anybody please shed some light on this and let me know how I can
find it and if there are tricks to replacing it.  Thanks.

Regards,
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