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Check Engine Light, diagnostic questions
Posted by 02Pilot (more from 02Pilot) on Tue, 18 Jun 2019 11:46:13
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1989 900S, LH2.4. Background: I bought the car three months ago and have spent the intervening months dealing with a lot of general neglect. I've had a bunch of stuff apart in the engine bay, including detaching various electrical connectors, but I haven't replaced any fuel injection sensors or components. Battery is recent, primary power and ground connections are clean and tight. Operating voltage is good.
Took the car out for its first test drive after all the work and was greeted with a CEL after about 20 minutes of driving. The light was steady when the throttle was open at all, and blinking with the throttle closed. There was no other indication of any issue, and the engine continued to run normally.
I pulled the fault codes when I got home and found two: 12112 (oxygen sensor self-compensating circuit problem (incorrect air-fuel ratio at idle)) and 12114 (AIC self-compensating fault (system unable to increase idle to an acceptable level)). It is worth noting that the idle seemed to be fine, and only dropped temporarily when the big amperage draw of the radiator fans kicking on occurred.
The oxygen sensor is of unknown age and condition, so that certainly warrants testing. The AIC needs to be checked as well. Beyond these two specific components, are there other likely culprits for these fault codes that I should be looking at? And is this typical behavior for the Check Engine Light on these cars (solid for an existing fault, blinking for an active fault)?
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