I've got a '95 S500 with 191k miles and the Check Engine light on. The local dealer diagnosed the problem and replaced the deteriorated shaped rubber hose on the Air Injection Pump and reset the light, but the light promptly came back on. Dealer said "it's the Air Injection Pump" and siad it needs to be replaced.

Dealer price is around $1400 for the pump, plus labor. (Whew!)

I found the pump at a reasonable price, (reman, $641.98, $350 core) and I am confident I can handle the replacement of the pump. Alldata DIY has a nice procedure and diagrams.

Question is, can I reset the Check Engine light without a scan tool when I complete the job? What's the trick? I've read on this board that you can unplug the light module on an SL to reset it... is there a similar trick on the W140? If so, which module?

Thanks in advance,

- Kevin

I believe you can disconnect the battery for 1/2 hr to clear the CEL.

Thanks for the tip.

I bought this car used, and I don't have the radio code. If I do disconnect the battery, will I have to re-code the radio?

YES, the dealer can provide it sometimes if they want to and the radio has not been replaced.

Thanks - I'll have to call them and see.

You can also get the radio code directly from becker.

They have a website with a forum.

www.beckerautosound.com

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".