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jb92563 · 04-16-2015, 05:50 AM

I also had a P0420, the Bank 1 cat code and it turned out to be the MAF.
(Accompanied by P01026, P01033)

I sprayed the MAF and the plug/harness contacts with MAF cleaner, then cleared the codes and the code has not come back in a week of daily driving.

I also pulled the air filter and found bits of paper in the filtered side of the airbox, that looked like a part sticker had come apart and somehow ended up on the filtered side down by the water drain hole.

Probably a contributing factor to fouling the MAF.

04-16-2015, 05:50 AM	#5
jb92563 Registered User Join Date: Apr 2012 Location: Riverside, CA Posts: 1,665	I also had a P0420, the Bank 1 cat code and it turned out to be the MAF. (Accompanied by P01026, P01033) I sprayed the MAF and the plug/harness contacts with MAF cleaner, then cleared the codes and the code has not come back in a week of daily driving. I also pulled the air filter and found bits of paper in the filtered side of the airbox, that looked like a part sticker had come apart and somehow ended up on the filtered side down by the water drain hole. Probably a contributing factor to fouling the MAF. __________________ "It broke because it wants to be Upgraded " 2012 Porsche Performance Driving School - SanDiego region 2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP, Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)