My "check engine" light just came on but the diagnostics says No Malfunction? on 2000 Mercedes-Benz S430

I do not have a manual. I did check oil level and appears OK. Pleae advise. Thanks!

by in Newport Beach, CA on August 30, 2011
2 answers
ANSWER by on August 30, 2011
What diagnostics? Find someone who has a diagnostic tool that can read data on the enhanced side of the PCM not just a generic OB2 code reader.
ANSWER by on August 31, 2011
Scan for trouble codes using a professional grade scan tool have trouble codes stored, pending codes and "freeze frame" information printed so the trouble codes can be properly diagnosed.