Today I failed NJ inspection for my 02 F150 V6.

i failed for my check engine lights/emissions. I got the codes

p1131---Lack of Downstream Heat oxygen sensor switch

p1151---Lack of upstream Heat oxygen sensor switch

p0171---System To lean bank 1

p0174---System to lean bank 2


My guess I need to replace both oxygen sensors. However i also read when searching this forum that cleaning the MAF helps. Any other tips or ideas before i go buy the sensors?

 

From what i remember on my 93 T-bird they were pretty cheap so why not just change em out

 

yea its not to bad about $48.00 a piece, but I don't want to replace them if I don't half to or if it is something else maybe. Im in college every penny counts lol

 

hahahaha inspections good luck with that crap...lol

anyway cleaning the MAF is good. the other day i done my truck, my grandpas truck and the escort we have and they seem to run better. as fars as o2 sensors i dont really know anything about other than the fact that if they go bad they could cause you to get bad gas mileage.

hopefully someone else will jump in and help

good luck

 

If you've got 100k miles, you might as well replace em, but I see you've got the 4.2, I'd check for intake gasket/isolator leaks, that could very well be your problem, given you've got lean codes for both banks. It's possible it could be the MAF sensor, could be exhaust leaks, could be a fuel pressure problem, but what I've seen the most is vacuum leaks either from a large line or from the intake, on the 4.2.

- JB

 

thanks good to know. Yea the truck has about 70,000 miles on it

 

A new truck?

 

It Was A Fact That Was Told To Be A Long Time Ago When I Worked Parts Places... If You Change The O2 Sensor When You Change Pulgs.. Or Atleast Every Other Time, You Will Save Over 100 A Year In Gas... So In The Long Run They Pay For Themselves

 

bump and thanks for the new info.