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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: 18,745
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 <whatever it was> 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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