p0101

i just got a obd2 scan reader and the code p0101 came on the scan. at the moment the cel was on. then i checked every thing and i retighten the 2 brakets around the maf. drove a couple time to work and the cel came of. i put the scan tool to see if every thing is ok. and it showed the same code maf sensor p0101.should i replace the maf the engine seems to run fine.but my scan tool is a innova 3100a.and the yellow light is on(emmission status).is it the maf that needs replacing.and other question is it a good tool. i paid 150.00$ canadian for the tool.thanks so much for this forum i have all the question answers have a nice one.

did you clear the code after the first read. otherwise it is still stored. for that price the scanner ought to have that feature, otherwise disconnect battery voltage to the computer for 30 seconds.

//bc

The MAF might just be dirty. Some auto parts stores have MAF cleaner spray. If you cant find that use chlorine free brake cleaner (carb cleaner usually leaves a film). Just spray it real good, be carefull of the 2 thin wires (you'll see what I mean when you take it apart). They can break easy so dont hit them with full force spray close up. If you use a K&N or other oiled air filter use less oil, it will coat the sensor.

The emisions status might just be that it hasnt completed a test cycle. Some of them take a while to complete (evap system is usually the longest). It should show you what tests have completed on the display and which are still pending. I have the Innova 3030 (model below yours) and have had no complaints. Mine is able to erase codes so yours should. When you do it resets all the test sequences though so the ecu needs to run through them again.

My $49 code reader from Harbor Freight can erase codes. Pretty much a standard feature.