Hi, I just purchased a 1996 S420 from and ebay seller AS IS condition, but have problem passing smog. After taking my car to three different smog station and they said the monitor or engine light doesn't come on, I decided to take it to the dealer for smog check and troubleshooting. The dealer found that the electrical wires was connected to an after market electronics, which could cause the monitor light not to come on. The estimate for the repair so far is over $1100. One of the dealer's customer service rep. said the seller is responsible for providing me with a valid smog certification, is this truth? If it is what code is it under? Thanks in advance for your advice.
Dara