Check engine light

Julie Gunther

Asked by Sep 21, 2014 at 09:31 PM about the 1996 BMW 3 Series 318i Convertible

Question type: Maintenance & Repair

340 and 420
I own a BMW z3 roadster 96
Above are the codes that are
popping up for my check engine
light. Can you tell me how much this
will cost? And if it's an easy fix? I'm
trying to smog it:(

1 Answer

Tom Demyan

P0340 is the camshaft position sensor. I'd replace that first, the P0420 is a cat code which might go away after you replace the sensor.

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