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- Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor circuit poor electrical connection
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
The O2 sensor (2 on V engines) are in the exhaust system pipes before the catalytic converter, the next sensor is the efficiency monitor for the catalytic converter system it looks like a O2 sensor but performs a much different function as far as testing goes. The codes you have follow.
P0420 - Catalyst System Efficiency Below Threshold Bank 1 What does this mean? In most cases it means the catalytic converter is worn out and that is sensed by the catalyst monitor I spoke of earlier.
P0102 - Mass or Volume Air Flow Circuit Low Input Faulty mass air flow sensor - Dirty mass air flow sensor (located in the air intake hose to the engine from the air cleaner) - Dirty air filter - Mass air flow sensor harness is open or shorted - Mass air flow sensor electrical circuit poor connection - Intake air leaks
Hi there: This code is set when the MAF (Mass Air Flow) meter is not sending the PCM the correct information. This can be due to a bad conection of the rubber intake hose between the MAF and the Throttle plate opening, a dirty air filter, a dirty mass air flow or a bad mass air flow.
Most programmer have you tie into the iat sensor in the mass air flow. this can cause the the iat sensor oto short out.
Try cleaning the two cross wires inside the mass air flow sensor. (use Q-tip and carb cleaner) It is also possible that your oil pressure switch has a low pressure cutoff feature. If the pressure is low at normal idle, it will shut the engine down. Check oil pressure with a mechanical gauge and if it's good change the sending unit. (check to see if voltage flow through switch stops just at shutdown first though)