Nissan Titan Forum - View Single Post

**beason** · 07-04-2009, 05:28 PM

I got a check engine light on my truck. ran it up to autozone to run the code, and it came back p0420.

catalyst system efficiency below threshold - bank 1

probably cause
air leak in exhaust before rear h02s
Af sensor error
fuel system fault
faulty catalytic converter

Now, im pretty sure its the MAF, since when i had problems when the truck died, someone told me to clean it. I cleaned it using MAF cleaner, but i think that damaged it.

I feel this would be the most logical outcome.

Has anyone else had this error code?

Autozone quoted me over $200 for the MAF.

The previous owner removed the air box and installed a cone filter on the end of the tube, i would like to put an air box back in, would it be better to just get an aftermarket setup? do they come with MAF's?

07-04-2009, 05:28 PM	#1 (permalink)
beason Premium User iTrader: (4) Join Date: May 2009 Location: Webster, TX Posts: 758 Thanks: 24 Thanked 66 Times in 55 Posts	check engine light, bad news... I got a check engine light on my truck. ran it up to autozone to run the code, and it came back p0420. catalyst system efficiency below threshold - bank 1 probably cause air leak in exhaust before rear h02s Af sensor error fuel system fault faulty catalytic converter Now, im pretty sure its the MAF, since when i had problems when the truck died, someone told me to clean it. I cleaned it using MAF cleaner, but i think that damaged it. I feel this would be the most logical outcome. Has anyone else had this error code? Autozone quoted me over $200 for the MAF. The previous owner removed the air box and installed a cone filter on the end of the tube, i would like to put an air box back in, would it be better to just get an aftermarket setup? do they come with MAF's? __________________ 06 Galaxy Black LE Crew Cab BT. air box mod Armada air dam Aries stainless step rails Power Acoustik REACT1-1100 Class D2 1100-Watt Mono Amplifier with dual 10" kicker cv-r subs Dick Cepek DC-1 18" chrome wheels Flowmaster 50 dual in/out dumped. Soon to have: 2" drop shackles, Jet Tech mod, tinted tails, CAI.