Mercury Mariner Transmission Overheating: Symptoms + Causes

Overheating is the worst thing that can happen to your Mercury Mariner’s transmission.  An overheating transmission will drastically shorten its service life.  If you suspect that your transmission is overheating, doing something about it now can keep you from an expensive transmission repair later.  Low transmission fluid is the number one cause of an overheating … Read more Mercury Mariner Transmission Overheating: Symptoms + Causes

Mercury Mariner P1000: OBD Readiness Test Not Complete

P1000 is a manufacturer specific trouble code.  In the case of Ford vehicles manufactured by Ford (including the Mercury Mariner), it indicates that the OBD-II monitor testing has not been completed.  This often occurs when the trouble codes have been reset, or the battery has been disconnected/replaced. Auto manufacturers are required to have their OBD-II … Read more Mercury Mariner P1000: OBD Readiness Test Not Complete

Mercury Mariner Radiator Leaking:  Symptoms + Diagnosis

  Your Mercury Mariner’s cooling system passes antifreeze throughout its engine.  The main parts of the system are the thermostat, radiator, water pump, coolant itself, and the hoses.  If any of these parts go bad, you may experience radiator a leak.  A radiator leak is very common.  You should notice the leak directly under your … Read more Mercury Mariner Radiator Leaking:  Symptoms + Diagnosis

Mercury Mariner: P0720 → OSS Circuit → Malfunction

P0720 is a generic OBD II trouble code, which means that it has the same meaning for your Mercury Mariner as it would any other vehicle.  It indicates that your Mariner’s OSS (Output Shaft Speed Sensor) is reporting a malfunction. It’s typically caused by a bad OSS, or a wiring problem. The OSS works by … Read more Mercury Mariner: P0720 → OSS Circuit → Malfunction

Mercury Mariner P0520: Oil Pressure Switch/Sensor → Circuit

  P0520 is a common OBD2 trouble code.  It’s generic, which means that it has the same meaning for the Mercury Mariner 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 a … Read more Mercury Mariner P0520: Oil Pressure Switch/Sensor → Circuit

Mercury Mariner P0108:  MAP Barometric Sensor → High Input 

  P0108 is a generic OBD-II trouble code.  It indicates your Mercury Mariner’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 into … Read more Mercury Mariner P0108:  MAP Barometric Sensor → High Input 

Mercury Mariner P0443: EVAP System Purge Control Valve Circuit – Malfunction

P0443 is a very common OBD2 code.  It’s generic, which means that it has the same meaning for the Mercury Mariner as it would for any other vehicle.  If your Mariner has this code, it is indicating the EVAP purge control valve circuit is malfunctioning..  This is typically caused by a short in the wiring … Read more Mercury Mariner P0443: EVAP System Purge Control Valve Circuit – Malfunction