you need one of the so-called home brewed code readers.. you can get them on ebay... with a code sheet.... they can wipe out the codes, too.
if it's your CEL, I would say 90% of the time ...it's an o2 sensor.. which is an easy change...
if your gas mileage has dropped by 20% or so...it is the o2 sensor
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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)
1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus
1994 e320 Cabriolet 108k
1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it
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