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Clearing code #33 check engine light still on after replacing maf sensor

Changed maf sensor check engine light still on

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Check engine light can be as simple as the gas cap getting put on crooked. 5 stops and starts later and it will go off.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

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2015 ford taurus limited. Why does wrench light come on and stall the car out?


if yours is an automatic it might be the MAF sensor, if you unplug the MAF sensor and it drives again i would check the MAF sensor to see if its still working as it could be coated with muck from a damaged air filter or if you have change the air filter it could of let muck onto the sensor, when changing a dirty air filter its best to clean the MAF sensor with MAF sensor cleaner at the same time.

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This also happened to me and it was the heater matrix, whatever that is

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2008 Mercedes ML350 check engine light on after oil change. error codes 0170 and 0173 now show up after scan.


The error code 0170 and 0173 are related to Mass Air Flow (MAF) sensor. Check for any vacuum leaks and repair them if found. Else changing the MAF sensor may resolve the issue.

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Check engine light wont go off


did you clear the codes after you replaced the maf, the cel should go off after 50 cycles (ignition being turned off and on)

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After testing the MAF sensor, changing the PCV & CO sensors, I still get the check engine light, 1999 ford explorer sport 4.0 SOHC 6 cyl I've read to check the intake manifold and then go fu


What is a CO sensor? Never heard of it. a 1999 OBD2 ford has approximately 1600 possible fault codes most of which can turn on the light. If you dont know which one is turning it on, you are guessing randomly which is expensive and usually unsuccessful. get the code(s) and then diagnose the possible causes. The vehicle you list (99 4L explorer) rarely had injector problems. Much more common were EGR sensor(DPFE) sticking at voltage, evap problems, misfires, and lean conditions due to dirty MAF, or vacuum leaks. get the fault code, or you will not fix the problem.

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1993 Ford Tauras engine light comes on intermdently @ 45 mph then goes off . What to do for smogging?


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It actually is saying the air flow is low at the MAF passage. This can mean a clogged air filter or clogged ductwork. Your engine RPM may have changed from the tuneup. If this is the type of engine with the added spout to the distributor, you may have not reconnected it after setting timing.

A bad groundwire will also affect every engine setting overall or from the single badly grounded sensor. You may want to do an Ohm test on the plug-in wires for the MAF to its ECM. You may have a broken wire which would affect the readings.

Just to illustrate, if the MAF produced a fictious 1 volt at normal flow, then the timing and fuel enrichment are set for that RPM. But if the MAF reads .5Volt, it may enrichen the fuel or adjust timing for an engine running 3000RPM. This would flood the converter with more gas than was being burned and needed at idle and result in a Sulfur smell.

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P0068 on a 2006 Dodge Ram 1500 SLT. Rough "hunting" for idle. Momentary lag/loss of power from a stop. Random RPM changes while at a constant speed. Sometimes it feels like it drops out of gear...


P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

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Check engine light is on, tested with OBD reader and got P0171 system too lean bank 1 result.


There could be a vacuum leak downstream of the Mass Air Flow sensor or the Mass Air Flow Sensor is dirty or faulty. Try cleaning the MAF sensor wire elements and clear the engine computer code. After removing the MAF sensor, spray the honeycomb inside the sensor, or the air meter with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling. Inspect all vacuum and PCV hoses, and replace any vacuum hoses that have cracks, cuts, etc. If it has been a long time since you changed your Fuel filter, it may be a good time to do this as well. This could also be due to a faulty O2 Sensor.

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