Ford Fairlane U0121 Engine Error Code

When you check Ford Fairlane car engine light came on code U0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Ford manufacturer may have a different definition for the U0121 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

Another consequence of U0121 Ford Fairlane engine overheating may be a blown head gasket. Heat makes aluminum swell almost three times faster than cast iron. Thermal stress can distort the head and make it swell in areas that are hottest like those between exhaust valves in adjoining cylinders, and areas that have restricted coolant flow like the narrow area that separates the cylinders. The typical aluminum head swells most in the middle, which can crush the head gasket if the head gets too hot. This will usually cause the head gasket to leak compression between adjacent cylinders, or leak coolant into the cylinders.

Ford Fairlane U0121 OBD-II Diagnostic Network (U) Trouble Code Description Ford Fairlane car U0121 OBD-II Trouble Code Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and comm Reason For Ford Fairlane U0121 Code The reason of Ford Fairlane U0121 OBD-II Engine Error Code is U0121 Lost Communication With Electronic Brake Control Module.

If your U0121 Ford Fairlane check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system and engine control unit are in charge of monitoring a bunch of different U0121 Ford Fairlane, and if they get a reading that's a little out of whack, up pops the check engine light.

Ford Fairlane U0121 Possible Solution :

Power Steering Pressure (PSP) Switch Signal Malfunction The PCM counts the number of times vehicle speed transitions from 0 to a calibratable speed. After a calibratable number of speed transitions the PCM expects that the PSP input should have changed. This DTC is set if the transition is not detected. Vehicle towed with engine running Power steering hydraulic concern was repaired but DTC was not erased PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged Check, if possible, if vehicle was towed or power steering service was performed. Observe PSP V PID while checking wires for intermittents.

What does fault code U0121 mean for Ford Fairlane ? What does a diagnostic reading U0121 mean for Ford Fairlane ? How to fix OBD2 Code U0121 for Ford Fairlane ? What do we know about U0121 code for Ford Fairlane ?