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#15: 12-22-2012, 06:16 AM
 
 ripemeat
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for what its worth, a tune issue isn't going to cause this code. the map table(AVCS timing advance) tells the ocv to switch and to let oil into the cam sprocket in order to advance its cam timing, the cam position sensor confirms its advance request. when the map table has x degrees of advance requested and the cam sensor is not seeing x, it will throw that code. cam sensors have their own CEL so if it was bad it would probably throw it. another thing is, maybe your timing belt skipped a tooth. that's another cause of the p0021 code. check your timing marks and maybe at the same time check your cam position sensor, maybe it's dirty? it's located on the top side of the head in the back, next to the furthest back injector.
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