I cleaned the MAF sensor, but the engine light came back on after a few miles. I was wondering what to look for next....TPS?.....injector?
Thanks for the comeback, the truck is a 2011 2500hd with a 6.0l vortec. I put a new sensor in on the driverside after the converter; however the problem is still there.
check for exhaust leaks and wiring / connector O2 sensor damage. another thing could be the cat converter or the PCM connectors . check all the PCM connectors for any corrosion . look very carefully on the pins of the PCM connectors... remove the negative battery ground when checking the wiring / connectors..you only have the P0138 code ? use a scan tool again >>>.