Just had a new Oxygen sensor installed in my 89 190 E 2.6 (tried the ford mustang one but it was a no-go). Actually neither did the generic 3 wire one. My dealer has a Lambda meter and all went well. However...and I say this only as a "seat-of-the-pants" observation my car seems kind of "sluggish" now after the new sensor. It idles fine and I don't notice any roughness or anything but it just feels like I'm running on a lower octane gas. Just doesn't have the same "feel" that it used to. Since we are all Benz fans the term "just doesn't have the same feel" should need no explaining..ha ha! Any thoughts? Fuel mix (now) either too rich or lean? Thought the ecu did all that?
Thanks for your input.

Dave Browning
89 190E 2.6

It may be running a little leaner now. If you want to, you can have the car set on the rich side and it will help.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

AT full throttle & durning warm-up the O2 sensor doesn't affect fuel mixture. It's job is to keep the fuel mixture LEAN durning normal driving so the engine doesn't cause excessive emissions. Have the "lamda" mixture set at 30-40 % & the engine will allow a bit more performance.