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Old 09-30-2012, 11:33 PM   #7
Beamer Creamer
Registered User
Join Date: Sep 2012
Location: Canada
Posts: 270
My Ride: 2005 bmw m3
Ive only used the platinum ngk 4prong. Start by switching mechanics even if u are friends. Sounds like he could have cost you alot for nothing. Sounds like your o2 sensors are doing what they are supposed to. So many people just change o2 sensors when code comes up even though alot of the time it was just telling you that your engine wasnt burning properly. O2 sensor codes come on when they hit a signal range of too high or too low too many times. Agreed check intake first. Can spray carb cleaner around fittings, hoses,etc. and see if you hear rpms change.
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