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'89, have tbl codes 312,113,221: need tips on how to begin... 200 1989

posted by  dbt on  Thu Mar 20 19:37 CST 2008
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last visit: Mon Oct 29 23:23 CST 2012
[RELATED]

Wife's '89 244, 170K: Check engine light came on and produced following codes:
312 - knock sensor
113 - Oxygen sensor (?)
221 - Bad AMM, air leak or low fuel pressure.

I plan to inspect all hoses and connectors, roll fuses again, and recheck codes. I reset codes to zero two days ago, but same 3 codes re-appeared.

Car runs fine and I notice no difference in performance.

1. Knock sensor: not sure how to approach that. Find it and replace it maybe.

2. Oxygen sensor: I guess I could just replace that. Last time was about 60K miles ago.

3. AMM, air leak or fuel pressure: I can clean AMM connector or try blowing out the guts in the AMM...I've never dealt with it before, (owned car since new). Air leak: just look around. Fuel pressure: I have no gauge.

Any comments on how to interpret these codes would be appreciated. Thanks, Dennis






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