1992 300e
 

Hi everyone,I need to change 02 sensor how much change it will make on engine?

How long has it been since you last changed it?

when i got the car it has 132000 mile, now 195.000 dont know before that

I'd say its probably time, even more so if you have no history prior to 132k. The OEM Bosch one is ~$120. If you are handy with wires and solder, you can solder the one from a 1990 Mustang GT as it uses the same sensor for ~$35 to the factory harness. MB just decided to charge $90 for the wire :(

The "standard" is every 60k...but I've heard the real interval is ~100k assuming no idle or mpg issues.

Thanks for info,has to be bosch not after market .why not A.market?

I would stick with Bosch, the price difference is not worth going away from OE.