Also, you might notice power loss and hesitation on acceleration to check the engine light.Ĭodes: P2004 and P2009 (Intake Manifold Runner Control) 8. It is also possible for vacuum hoses to break. You might have problems related to this system if the solenoids get stuck. This system is controlled by ECU and vacuum operated. Geometry variation is performed by swirl flaps that direct the stream of intake flow. Most newer Mazda engines have variable intake geometry manifold. For instance, you might have a misfire or poor throttle response. This can cause all sorts of engine running problems and give some misleading error codes. Carbon Buildupĭirect injection engines are prone to carbon build-up on intake valves. Rule this out before changing a much more expensive catalytic converter.Ĭodes: P0420 to P0431 (Catalyst Efficiency Below Threshold) 6. Although this will be signaled as a catalytic converter with low efficiency, you easily have faulty downstream oxygen (O2) sensor. If you drive a higher-mileage Mazda, you will likely encounter an emission control that causes a check engine light. If they don’t show any symptoms of deterioration, you should check the fuel tank pump union nut. The purge valve is the first thing that needs to be checked for leaks and fuel ventilation lines. Your Mazda might have a check engine light on that is, in some cases, accompanied by a strong gas odor. Evaporative Emission Control System Leak Detected Another possibility is an intake leak.Ĭode: P 0171 4. This is another common problem with high mileage Mazda3 and Mazda 6 models.ĭon’t use anything else than MAF cleaner fluid for cleaning. This is usually caused by a dirty MAF sensor, which gives false air flow readings. Your engine is likely running lean if you are experiencing rough idle, lack of power, or hesitation on accelerations.
#Coolant thermostat check engine light code
Common on Mazda 3 where check engine light is on, and code P0126 is present. The result is an engine that is not able to reach operating temperature. A thermostat stuck in an open position is a probable cause in this case. ThermostatĪnother common problem is a check engine light caused by low coolant temperature. Mazda CX-7 had a lot of problems with stretched timing chains. Another possibility is a faulty solenoid. In most cases, this is caused by a dirty VVT filter screen. Timing ChainĮngines with a variable valve timing (VVT) sometimes suffer from over retarded timing. Every situation is different, so you should read the codes to determine why the CEL light is on in your Mazda. Here are some common problems that trigger Mazda’s check engine light to come on.
#Coolant thermostat check engine light free
Research each code and remember that many issues can trigger one code.Īuto parts stores such as Advance Auto Parts, Autozone, PepBoys, and O’Reilly may read your Mazda check engine codes free of charge. The fault code is the starting point for diagnosing the check engine light on a Mazda.
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