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As posted many time in the past....
Test then replace is the only real path to problem solving. O2 sensors are easy to read live through the OBD2 port and have a good soft and hard failure codes to warn you of issues.
If your ownership practices include using good gas and monitor your fuel consumption rates everything else will work as planned by the design engineers. Short trips will accelerate failure to 60/80K, while most last to 100K+
The element heaters that are built in are the first function to go bad unless the sensor tips are exposed to antifreeze, oil, or REALLY bad gasoline.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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