1998 740il ODB codes - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-18-2011, 11:43 PM
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1998 740il ODB codes

Need help, Check engine light.

1) Electric thermostat final stage

2) pre cat o2 sensor aging

3) fuel trim QL additive

Looks like 1 and 2 are warnings, but #3 not sure about.
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#2 (permalink) Old 09-19-2011, 03:40 PM
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Is it running "rich" or even misfiring?
Have a smell at both tail-pipes a get back to us with your results mate!


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#3 (permalink) Old 09-19-2011, 03:47 PM
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No Misfire, no smell it's running rich, No smoke coming out when accelarating.
Car is running smooth even during idle.
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#4 (permalink) Old 09-19-2011, 03:53 PM
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TBH I would firstly disconnect the battery for an hour to reset any OLD codes...
Reconnect and notice that the car might run a little worse for a while as the ECU Re-Learns your driving techniques/habits lol... And maybe while it's disconnected, why not clean the MAF? This might be causing the richness.
Just an idea my friend !!


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#5 (permalink) Old 09-22-2011, 12:32 PM
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Quote:
Originally Posted by Dabsy View Post
TBH I would firstly disconnect the battery for an hour to reset any OLD codes...
Reconnect and notice that the car might run a little worse for a while as the ECU Re-Learns your driving techniques/habits lol... And maybe while it's disconnected, why not clean the MAF? This might be causing the richness.
Just an idea my friend !!
I just recently noticed a random puff of smoke sometimes when accellarating from a full stop. Thanks

were is the ECU and MAF location.
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#6 (permalink) Old 09-22-2011, 02:14 PM
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The ECU is under a plastic cover under the hood behind the suspension strutt.
The MAF's are between the airboxes and throttle-body...


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#7 (permalink) Old 09-24-2011, 12:42 AM
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Thanks. I'll check it out.
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