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