Quote:
Originally Posted by jfoj
Do not worry, they will be back and you will start to have more problems.
Vacuum leaks and lazy pre-Cat O2 sensors are the most likely culprits. I know the M54 3.0l quite well, the problems are the same across the body styles, however, the X5 has a slightly larger engine compartment so the problems show up a bit later than on the smaller 3 series bodies. More free air space and slightly cooler under hood temps in the E53.
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I'm certain that none of the O2 sensors has ever been replaced, so should I just go ahead and replace the pre-cat sensors?
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2003 E53 3.0i
DOB 10/15/2002
Sienna red, Savannah Beige Dakota leather
Type FA53, Engine M54B30
2018 G02 30i
DOB 4/21/18
Black Sapphire Metallic / Canberra Beige Vermasca leather
Engine B46O