List of trouble codes for the 4.2L V6
#19
i have a 2004 f150 4.2 v6 ive had it for a several years now i keep up on it pretty good,but ive been having a problem. i notice it more when the weather is cold outside...when i start the truck its fine but as it warms up a lil the rpm's stuck jumping up and down. the truck acts like it just wants to jump off the ground at times.i took it to auto zone and i got p0174 system to lean on back two...ive cleaned my mass air flow sensor and still no change...i know i still have o2 sensors to change is there a certian one i should start wth or should i just change both of them on bank two? i do alot of driving back and fourth to orlando and cant have any major problems happen thanks for any help
#20
That code is not a symptom of a bad O2 sensor. It's REPORTING that you have an uncorrectable lean condition. Check for vacuum leaks. If you DO replace the O2 sensors, the front ones are all you need to deal with - the only function of the rear sensors are to monitor cat efficiency for emissions reporting and will not affect the way it runs at ALL.
#21
#23
#26
while we're at it, lets stick a throttle body spacer and tornado fuel saver on the truck as well
#28
well how do i know which code reader is the correct one for my truck? And is it true that if the truck has not been running for a while (such as five years) that the computer will not give you codes because of it not running?