I change my Knock sensor and MAF but, still have 3 engine codes..
P0102
MAF or VAF Cicuit Low Input
P0443
EVAP Emission Contrlo System Purge Valve C Fault
P0449
EVAP Emission Control System Vent Valve/Solenoid Malfunction
Worst of all..... My truck is running like ***!!! So.... any ideas?

 

Try Your Oxygen Sensors, Make Sure You Buy The Ones From The Dealer And Not Autozone , I Had The Same Problem And The Oxygen Sensors Where The Froblem

 

How much are the 02's from the dealer

 

Check for cut or disconnected wires. Check your engine ground wires for good connection, also. Makes sure all grounds are tight.

 

it's most likely your 02 sensors...go to the factory and buy new ones....I'm not sure how much they are, but they are cheaper than an auto parts store....

 

i've read all posts and not one person mentioned maybe its your tune? Its obvious the Jesse tunes have had problems, if not right away than a couple months down the road.

 

Teh tune might be the problem, many factors to pin point.

 

Ive had his tune for over a year and never anyproblems. If anything my truck ran like a beast. Thats wierd.. The only time I had a problem, it turned out to be my knock sensor. Changed it and it ran normal. I had him tune my compter in march, When I put the 4:10 gears in.. Im gonna have tuning done again but, get rid of the rear O2's, pullin off the cats, have it run in Speed density mode, and get rid of the EGR valve... Anyways.. I was looking through all the connections and when I looked at the sensor on top of the manifold behind the throttle body. I tried to check for any voltage coming out of it and there was no electric current. Think it may be the sensor or the connection itself?