Daytime running lights (or DRL) are specialized lights that come on when your Mercury Montego’s regular headlights are turned off. Their purpose is to make it easier for other drivers to see you, theoretically decreasing the odds of getting into an accident. If your Montego’s DRL warning light is on, the powertrain control module (commonly … Read more
P1289 is a manufacturer-specific diagnostic trouble code. In the case of Ford-built vehicles (such as the Mercury Montego), it indicates that the cylinder head temperature sensor returned a value to the powertrain control module (PCM) that was greater than the signal should be during a self-test cycle. The most likely cause of P1289 is a … Read more
P2271 is a generic DTC trouble code that can affect the Mercury Montego. It indicates that the oxygen sensor located on bank 1 in the second position is continuously sending voltage with a value that is too rich. There are oxygen sensors on both sides of the catalytic converter. The “upstream” one is used for … Read more
P2279 is a generic OBD-II code. It indicates there is a vacuum leak coming from your Mercury Montego’s air intake system. While P2279 is a generic code (it has the same definition for the Montego as it would any other vehicle made after 1996), repair steps will vary based on model year and engine. The … Read more
P0605 is a relatively rare OBD-II trouble code that can occur in the Mercury Montego. 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 most … Read more
P0116 indicates that your Mercury Montego’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 causes … Read more
P0117 is a generic OBD2 code. It indicates that your Mercury Montego’s PCM (powertrain control module) has detected the signal coming from the engine coolant temp (ECT) sensor has a voltage level below its normal operating range. With the ECT sensor, as the voltage level drops, it will appear that your Montego is overheating. While … Read more
P0743 is a generic OBD2 code that can occur in the Mercury Montego. 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 Montego’s model … Read more
P0776 is a generic OBD2 code that can occur in Mercury Montego’s equipped with an automatic transmission. This code indicates that the pressure control solenoid “B” inside your Montego’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 of P0776, … Read more
P0400 is a standard code that indicates your Mercury Montego’s EGR system is not working. The good news is that this code is not a breakdown risk and should not affect how your Montego runs (assuming it’s the ONLY code). P0400 is a generic code, which means it has the same definition for the Montego … Read more