P0015 is a generic OBD II 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. VVT changes the frequency and distribution of gases entering and exiting the combustion chamber. It allows … Read more
P2096 is a generic OBD II code, which means that it has the same meaning for the Mercury Grand Marquis as it would any other vehicle. It specifically indicates that your Grand Marquis detected that it is running too lean (too much air for the amount of fuel present). Bank 1 is the side … Read more
If your Mercury Grand Marquis is experiencing unusually high oil pressure, you need to find out what’s causing it right away. Unusually high oil pressure can indicate serious problems, such as a blocked oil passage, or a broken pressure relief valve. It should be treated like you have no oil pressure until you verify what … Read more
P0606 is a generic OBD II code. Which means that it has the same meaning for the Mercury Grand Marquis that it would for any other vehicle. If your Grand Marquis has P0606 it’s highly likely that the ECM/PCM (engine or powertrain control module, they mean the same thing) has failed. The PCM regularly performs … Read more
P0603 is a generic OBD2 trouble code. It indicates that your Mercury Grand Marquis’s keep alive memory has had an error. Keep alive memory is the data that your Grand Marquis’s PCM (Powertrain Control Module) has learned about how your engine conditions. All of this sensor and driving input data is used to keep it … Read more
P0522 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 below its normal operating ranged. 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
The Mercury Grand Marquis utilizes a crankshaft position sensor (CKP) in order to regulate the engine timing. This sensor uses a reluctor to gauge the position of the crank. When the Grand Marquis’s ECM determines that the signal coming from this sensor is out of range, it’ll throw the P0336 trouble code. P0336 is most … Read more
P0308 is a fairly common trouble code with the Mercury Grand Marquis. It’s and OBD2 code and means that a misfire has been detected in the 8th cylinder in the firing order. You should only be seeing this code if you have an engine with at least 8 cylinders. So, it’s mostly a code … Read more
P0307 is a fairly common trouble code with the Mercury Grand Marquis. It’s and OBD2 code and means that a misfire has been detected in the 7th cylinder in the firing order. You should only be seeing this code if you have an engine with at least 7 cylinders. So, it’s mostly a code for … Read more
P0125 is a generic OBD-II code. If your Mercury Grand Marquis has registered it, means that the ECM/PCM is getting a signal from the engine coolant temperature sensor (ECT) that the engine is not warm enough to enter closed loop fuel control. P0125 is usually caused by a bad thermostat, low coolant, or a bad … Read more