Im trying to smog the vehiche but there are 3 tests obd2 isnt performing. on 1996 Mercedes-Benz C220

Catalyst, egr and 2nd air are the 3 test the computers not performing, on a 1996 there can only be 2. Ive tried the drive cycle a couple times but its still not passing.i need to smog vehicle. What can I do?

by in Los Angeles, CA on July 09, 2014
2 answers 3 comments
ANSWER by on July 09, 2014
have a mech scan it for poss pending codes and also live data to determine cause of monitors to not reset
COMMENT by on July 09, 2014
Ive had it scanned by 3 mechanics, theirs no codes, also all systems are coming up normal. Ive been told I just need to drive it. I put almost 400 miles on it , performed the drive cycle 2 times and I still have 3 tests not being performed. Question , is it normal to lock the trunk with key and have Door locks lock at the same time..locks dont lock with key at drivers door. Im wonder if theirs a short and if so, if thats whats causing 3 obd2 tests not to perform . I need to have at least one of the three test to perform in dorder to pass smog.What can I do.?.
ANSWER by on October 20, 2014
I had the same problem and was able to solve it by replacing the overload protection relay (part #0005406745) which sells on for $20 or $55 depending on which manufacturer you choose to go with. Solved my problem and I bet it would solve yours.
COMMENT by on October 21, 2014
Thanks, ill check into it.
COMMENT by on February 09, 2015
Hi any update if it fixes it. Mine is saying obd not ready? Is it same?

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