Any update on this one, FM?
Having the same ECM-603D code since few weeks, originally it was thrown with MAF sensor code (and with some acceleration surges), now it only persists on its own and apart from car feeling a bit sluggish it perfectly fine.
MAP sensor is 73k miles old, Bosch
TCV is 33k miles old, Pierburg
CBV is 33k miles old, Volvo
MAF sensor is probably original or not replaced since I got the car (90k miles+)
I have feeling I whould start with MAP sensor and see how it goes, would love to do smoke-test but so far havent found any garage around that does this nearby me...
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