2008 Mercury Mariner P0121 Fault Code Check

When you check 2008 Mercury Mariner car engine light came on code P0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Mercury manufacturer may have a different definition for the P0121 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

Another consequence of P0121 2008 2008 Mercury Mariner 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.

2008 Mercury Mariner P0121 OBD-II Diagnostic Powertrain (P) Trouble Code Description 2008 Mercury Mariner car P0121 OBD-II Trouble Code The throttle position sensor ( Reason For 2008 Mercury Mariner P0121 Code The reason of 2008 Mercury Mariner P0121 OBD-II Fault Code Check is P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance.

2008 Mercury Mariner P0121 Possibble Fix Ways :

Check your choke plate. Is it positioned correctly? Is it still working as it should? Does it open completely? If not, then you either replace it or repair it. If the damage is quite severe, I suggest you put down your repair tools and start looking around for a replacement choke plate to avoid a repeat of this nasty episode.

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0121 2008 2008 Mercury Mariner code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

What does fault code P0121 mean for 2008 Mercury Mariner ? What does a diagnostic reading P0121 mean for 2008 Mercury Mariner ? How to fix OBD2 Code P0121 for 2008 Mercury Mariner ? What do we know about P0121 code for 2008 Mercury Mariner ?