The P0128 OBD II trouble code indicates that your Mercury Grand Marquis’s engine coolant temperature has not reached its required operating temperature within a certain amount of time after starting the car. This code can appear as soon as you start your vehicle, or it can also occur while driving. It’s essential to address this … Read more
P0122 is a common trouble code with the Mercury Grand Marquis. It’s an OBDII code that references issues with the Throttle Position Sensor (TPS). It is relatively serious problem since it can leave your vehicle stranded or severely limited. OBDII code P0122 is a serious problem that requires serious attention. Diagnosing it can … Read more
P0113 is an OBDII trouble code that occurs when the Mercury Grand Marquis’s engine management computer detects that there is an issue with the Intake Air Temperature (IAT) Sensor, specifically that there is a High Input Problem with it. P0113: IAT Sensor – High Input Problem The IAT sensor is responsible for measuring the air … Read more
P0121 is a relatively common trouble code with the Mercury Grand Marquis. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. It is relatively serious problem since it can leave your vehicle in failsafe mode. OBDII code P0121 is a serious problem that requires serious attention. Diagnosing it … Read more
If your Mercury Grand Marquis has the P0304 trouble code, you should know that it’s about as common of a code as there is. It’s a generic OBD IIcode (same meaning for all vehicles) that indicates that your car’s fourth cylinder is misfiring. P0304 is a drivability concern and should be dealt with right away. … Read more
P0457 is a somewhat common trouble code with the Mercury Grand Marquis. This code references a number that is given to you when you plug your Grand Marquis into a OBDII scanner. P0457 Indicates that there is a leak in the Evaporative Emission Control (EVAP) System. It is similar to P0455 (large leak) and P0456 … Read more
P0012 is a common trouble code. It affects vehicles with variable valve timing (VVT). The list of VVT vehicles is growing, and the Mercury Grand Marquis can have VVT, and is known to develop this code. P0012 is generic, which means that it has the same definition for the Grand Marquis as it does on … Read more
P0302 in the Mercury Grand Marquis is a common OBD II trouble code. It indicates that your car’s second cylinder has a misfire. P0302 is a real drivability concern and should be dealt with right away. If it’s bad enough to cause your Grand Marquis’s check engine light to come on, you shouldn’t drive your … Read more
This page is meant to help you troubleshoot the Mercury Grand Marquis P0430 trouble code. It covers the P0430 code’s meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of … Read more
This page is meant to help you troubleshoot the Mercury Grand Marquis P0420 trouble code. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. … Read more