You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
If you have any problems with the registration process or your account login, please contact contact us.
E12, E28, E34, E39, E60General discussion and technical help for all year 5 series cars.
User not setup in Rate My Car. Click here to set it up.
Your Ride: 523 E39 1997
523 E39 problem
i have a hell of a problem with my BMW 523i `97
the motor starts fine etc etc runs great smooth when shes cold (about2-3 minutes) but as the temp rises
it runns rough!!! as the temp rises above 1/4 its feels like a misfire bad tickover when you drive its it misses occasionally and can be sluggish at times, loose power, etc...
now i do own diagnostics carsoft the error in the dme comes up as
203 lambda regulation limit exceeded oxygen sensor 2
bank 2 cylinder 4-6
202 lambda regulator limit exceeded oxgen sensor 1
bank 1 cylinder 1-3
Also, in Carsoft Live data, comes something like:
Lambda sensor 1 heating voltage: 0.7V-4.8v (non-stop fluctuating)
Lambda sensor 2 heating voltage: 4.78V (unchangeable and fixed)
i have reset the error lots of times and again it comes up when engine is warm(no engine light on )
I`m replaced: CCV, ICV, crankshaft position sensor, spark plugs, all filters, intake gaskets.. and i`m still got the problem.