One of the most common problems that can occur in the life of a vehicle is a bad starter, that includes the Mercury Grand Marquis. It is important to determine whether or not it’s a bad starter that is keeping the vehicle from turning over. If your Grand Marquis is not starting, don’t assume … Read more
P0720 is a generic OBD II trouble code, which means that it has the same meaning for your Mercury Grand Marquis as it would any other vehicle. It indicates that your Grand Marquis’s OSS (Output Shaft Speed Sensor) is reporting a malfunction. It’s typically caused by a bad OSS, or a wiring problem. The OSS … Read more
P0520 is a common OBD2 trouble code. It’s generic, which means that it has the same meaning for the Mercury Grand Marquis as it would any other vehicle. P0520 indicates that the oil pressure sensor is operating outside of its normal “range”. It is typically caused by a bad oil pressure sensor switch or … Read more
P0108 is a generic OBD-II trouble code. It indicates your Mercury Grand Marquis’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range. The voltage is too high. It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming … Read more
P0443 is a very common OBD2 code. It’s generic, meaning it has the same definition for the Mercury Grand Marquis as any other vehicle. If your Grand Marquis has this code, it indicates the EVAP purge control valve circuit is malfunctioning. This is typically caused by a short in the wiring to or from … Read more
P0521 is an OBD2 diagnostic code that is triggered when your Mercury Grand Marquis detects that the value being sent from the oil pressure sensor is out of its normal operating range. It is typically caused by a bad oil pressure sensor or an issue with the oil system, and should be diagnosed and fixed … Read more
P0562 is a common OBD-II trouble code. It’s a general code, which means that it means the same thing for any vehicle, including the Mercury Grand Marquis. P0562 indicates that the system voltage is below 10 volts for a solid minute. With the engine running, the system voltage should be 14.1-14.4 volts, and it’s typically … Read more
Your Mercury Grand Marquis’s water pump is one of the most crucial parts of the engine. If it doesn’t pump water through the engine, it’s going to overheat and do a lot of damage. Typical signs of a bad water pump include overheating, white smoke, a bad smell, rough idle, and more. A water pump … Read more
If your Mercury Grand Marquis is running hot, it is a serious problem. If it gets too hot, it leads to overheating. A hot engine is usually caused by a few different things, such as the thermostat, water pump, radiator, or outside conditions. Mercury Grand Marquis Running Hot Symptoms Obviously, the main symptom … Read more
A rod knock is a very serious problem. If your Mercury Grand Marquis has a knocking rod, it’s almost always going to be caused by a failure of the rod bearing or the rod caps (leading to a spun bearing) or lack of oil. If you do have a rod knock, don’t ignore it … Read more