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Old 10-19-2001, 04:00 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,114
Steve Brotherton has an excellent article in the DIY section, but there's nothing specific to a 91 420SEL. is the website I was thinking of. It doesn't have any V8 engine codes. It also doesn't describe how to check your car without tools.

I took my SE to the dealer when the check engine light came on. The advisor pressed some buttons on or near the ECU, read code number and claimed it to be the air temperature sensor. Sure enough, I had started the car with the air temp sensor disconnected. It was a similarly simple matter to reset the ECU without disconnecting the battery. No charge.

91 300SE
81 300SD
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