1999 Cadillac Catera base 120k.

Asked by 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

121,045

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

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Best Answer Mark helpful
121,045

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

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