Hi everyone!

This happens with my 99 to!
But, only when i drive in a sport way, or when the temperature is too high in the outside.

 

iv got a 98 C230 and mine does this also. i have a cousin who works on them whom i have recently called, and he said it might be a vacuum leak. it does it whenever i accelerate.

 

You might have a failing O2 sensor.
My AC is intermittent and until recently, I didn't notice the connection between an also intermittent ECL.
Turns out the ECL code is PO161 (02 Sensor Heater Circuit Malfunction)

So, maybe, just maybe, an 02 sensor is beginning to fail-- but not yet throwing a code-- and shutting down your AC?

 

The entire A/C unit shuts on and off rapidly...very weird. Last summer I replaced the A/C unit because it stoped working, and I think this occured because of this malfunction, shutting on and off by itsself in hot weather, when im trying to use the A/C.

How do I get the ECL code? 1997 C230

How easy is it to replace that O2 sensor?

 

You can get the ECL (engine check light) code at your repair shop; most shops will plug in, and read engine codes for free.

OR, you can go to AutoZone. (AutoZone is an auto parts store) They will read it for free in hopes you'll buy the needed part from them. But, they don't presure you too.

If an O2 sensor is dying, it will probably turn on your ECL in the dash.
YOu will then have a code to read. No light-no code, I would think

Changing an O2 Sensor is a DIY (do it yourself) job for most people. The sensors are screwed into the exhaust pipes, either before the catalitic converter or after. The engine code will tell you which sensor is bad. You'll then need the location on the pipe because there is more than one O2 sensor. (Mine is a V-6, so the configuration will be different than your in-line 4) Then all you need is a specialized socket (AutoZone rents them-but I don't think they cost over $10 dollars) and a driver. The O2 sensor I need costs $140 at AutoZone, but I've found it on the web for $103. It is a Bosch replacement part.

Good luck.

Do a search on O2 sensors. There are folks on this sight that know tons more about it than I do. I haven't actually changed one yet.

 

hey i had a clk 430 and mine was shutting off and turning on when it felt like it, they wanted me to replace the blowers and everything, i had my guy look at it and all it was was a module thing that was located under the glove box, it was shorting out, and i think the part was like 60 bucs, and the air worked fine, i cant remeber the name of the part but you should try the small things first.