1999 Cadillac Catera base 120k.

Asked by FatMick May 31, 2014 at 02:02 PM

Question type: Maintenance & Repair

Just changed all spark plugs and coil packs for both banks. Cleared all codes and
lights.Car ran great for 1 week and now check engine light is back on and codes for both
banks running rich are shown. Car idles and drives perfect even with light on, and mileage
is down. Any suggestions?

2 Answers
199,785

dandyoun answered 9 years ago

http://www.obd-codes.com/p0172 - check this out for possible causes and solutions.

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199,785

dandyoun answered 9 years ago

http://www.obd-codes.com/p0175 -- they both the same just different bank.

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