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.