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Check Engine light on 200 1989

posted by  pamb3 on  Sun Jul 26 07:51 CST 2009
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last visit: Wed May 19 06:44 CST 2010
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Took my 1989 240DL in because check engine light came on. Mechanic ran test on fault codes. He said that if all the codes were real than my car wouldn't be running at all. Car is running perfect. Just the light is on. He replaced the main relay. Two days later the check engine light came back on. Car is still running fine. Here are the codes it comes up with. Does anyone think this is an Air mass meter problem, even though the car runs so well? Also what is an Air heater hose. There is this accordion looking hose ( approx 3in dia )that the mechanic said doesn't need to be connected?

Fault codes in the EMC:
223 Idle valve signal missing
312 Knock enrichment from ignition module missing
131 RPM signal from the ignition module missing
121 Air mass meter signal missing
212 Oxygen sensor signal missing or erratic

Fault codes in the ignition module:
214 RPM signal missing






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