My '95 540 started running terribly - would die when cold and shuck like a washing machine all the time. Check engine light was on and codes showed both oxygen sensors. I replaced them both and cleared the codes, but still got one bad sensor code. I had a crack in the intake bellows, between the air filter and the intake and had ordered the part, but it took about 10 days. When that was replaced, I cleared the codes and it's running smoothly with the same oxygen sensors in it. The other strange thing, is Bavarian Automotive, Bosch, and a couple of other sources, all showed different Bosch part numbers for that car. Nobody agreed on the 95 model with manual tranny. But I'm going to run it until I get a code, hopefully another 60K. Lesson, check for leaks under the hood before replacing oxygen sensors.
oxygen sensors
- Thread starter slickbrave
- Start date
After 1 month of running great, the problem has shown back up, but probably worse. It won't get over 60 MPH with the pedal to the floor. I'm going to put new oxygen sensors in again, but different ones. As I said, depending on which source you ask, you get 3 different answers for which sensors are the correct ones for this thing. Any other ideas?
Yeah i think I am having the same problem on the '99. It cold starts horribly and the check engine light is on. Took it to the "stealer" and they ran the codes(for free) and it said an "intermittant spark plug failure....ALL 6!!! So I promptly went out and bought brand new plugs directly from Bosch and replaced them...cars seems to be running a bit better and no engine light(BMW had reset it for me). Yesterday the check engine light came on AGAIN.....my exhaust note seems to be a loooot deeper and pronounced of late...soo I am thinking that there is a potential hole somewhere in my exhaust setup....would that cause me to run rough and have a check engine light? I currently use 100octane fuel...
ive just had oxygen sensors replaced on 99 m5 and new prop sharft fitted as was making rattling noise now gone ,but getting noise now of like blowing or like missing when pressing the excellerator down ,wonder what this could be now ,doesnt seem to be responding like normal quite hesitant ,any ideas thanks
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My car is considerably older 90 525i, but I had the same issue....I just knew it was the sparks or the filter, turns out it was the Air flow meter/Mass air flow meter (I get confused). My mechanic tricked it with a code and its' doing better but it still, especially in traffic, gets choked up and doesn't accelerate as efficiently as before, just my .02, but check that just to be on the safe side. I think still the Bimmers always indicate "check engine" when there is an emissions issue.