P2279 is a generic OBD-II code. It indicates there is a vacuum leak coming from your Mercury Grand Marquis’s air intake system. While P2279 is a generic code (it has the same definition for the Grand Marquis as it would any other vehicle made after 1996), repair steps will vary based on model year and … Read more
P0605 is a relatively rare OBD-II trouble code that can occur in the Mercury Grand Marquis. It indicates that PCM (powertrain control module) is not passing its ROM (read-only memory) self-test when you turn the ignition on. While P0605 is a generic code (it has the same meaning for any car or truck), it is … Read more
P0116 indicates that your Mercury Grand Marquis’s engine coolant temperature sensor is sending a signal to the PCM (powertrain control module) that is outside of its normal operating range (in terms of voltage). While P0116 is a generic OBD2 code (it has the same definition for any car or truck), it has the same basic … Read more
P0743 is a generic OBD2 code that can occur in the Mercury Grand Marquis. It indicates that your ECU/TCM has found an issue with the torque converter clutch solenoid. It is a generic code (meaning it has the same definition for all cars and trucks). Repair steps are going to vary depending on your Grand … Read more
P0776 is a generic OBD2 code that can occur in Mercury Grand Marquis’s equipped with an automatic transmission. This code indicates that the pressure control solenoid “B” inside your Grand Marquis’s transmission is having a performance issue, or is stuck in the off position. P0776 Definition: Pressure Control Solenoid “B” – Performance/Stuck Here’s the definition … Read more
P0400 is a standard code that indicates your Mercury Grand Marquis’s EGR system is not working. The good news is that this code is not a breakdown risk and should not affect how your Grand Marquis runs (assuming it’s the ONLY code). P0400 is a generic code, which means it has the same definition for … Read more
P0103 is a common generic OBD2 trouble code that can occur in the Mercury Grand Marquis. In plain English, the MAF sensor voltage signal is outside of the accepted range (too high). It’s important to understand what the MAF sensor does. It measures the air density and volume between the air filter and the intake manifold. … Read more
P0106 is a very common OBD2 trouble code that can occur in the Mercury Grand Marquis. Simply put, this code indicates that the signal coming from the MAP sensor is not what it should be. P0106 Definition: MAP Sensor – Range/Performance P0106 is a generic OBD2 code, which means that it has the same definition … Read more
P0107 is a relatively common OBD2 trouble code that can occur in the Mercury Grand Marquis. In plain English, it indicates that the voltage coming from the MAP sensor is below the normal operating range. P0107 Definition: MAP Sensor – Circuit Low Input It’s a generic code, so it has the same meaning for the … Read more
P0056 is a somewhat common O2 sensor-related OBD2 trouble code. It is a generic code, which means it has the same definition for the Mercury Grand Marquis as it would any other vehicle. This code is almost always caused by a bad heated oxygen sensor or wiring issue and almost never creates drivability issues. P0056 … Read more