Hey guys, I have a p0100 code thrown.... MAF sensor.
Car:
2009 Yellow SS Sedan
55000 miles on it
All stock except K&N drop-in (54000 miles on it)

a little history... 2 days ago I had the oil changed and sometime later that day the engine light came on. Its not building boost much at all, maybe 5lbs in 3rd/4th and nothing in 5th.

I go home and swap out the K&N with the original air filter that came with the car (it had less than 1k miles on it). Now its building boost but the light is still on.

So i took it into the shop and they said it was a bad MAF sensor but would cost $200 to replace it (200 dollar deductible on my extended warrenty). I tell'em i can do better and order one from O'reilys.

Today I go swap it out and have them clear the code. And after restarting it about 3 times the code comes back. At this point I have them order another (I'll swap it out tommorrow afternoon).

My question to you guys is .. "What will cause this code when you're sensor is working fine?"

 

did you try cleaning your MAF?

Do you have a boost leak in the charge piping?

 

Sounds like you over oiled the filter. It's supposed to be a very light coating of oil, and you need to let it dry a bit before running the car.

If you've already run the car, I doubt you can clean it off the MAF since it'll be baked on. You can try though. Just get a can of MAF/electronics cleaner. You need to spray it all the way up into the MAF where the itty bitty wire is. Spraying the plastic doesn't do anything.

 

i've not cleaned filter in some time. i have a new MAF installed. and the p0100 comes on during the 3rd start after the code is cleared, when its first started and idleing no boost what so ever.

 

Like I said int he other section... it could be a boost leak. If you had the oil changed by someone they could have loosened one of the charge pipes or get to the oil filter. Usually a boost leak is P0101 but mine threw both the p0101 and p0100 when I was tuning for the BOV

 

Thanks, can it throw that at idle? I did get those two codes the first time. I'll check into it tonight.

 

Mine would only throw it when I was slowing down, driving normally, or at idle. I have no idea why that happens but when I was driving hard it never did it.

 

you could have a small crack in the IC, or a CP is loose...anything. Look everything over. What are you actually boosting to? Can you hear air moving or leaking out more than normal when boosting?

When my CP blew off, it was loud as **** and wouldnt boost.

 

Had the same issue.....my car is still at GM and wont build boost or stay running after changing MAF's. Hopefully yours is a easy fix.

 

Definitely want to check for a boost leak.

 

Yours is a cracked IC endtank.

 

This is an oft-quoted but rarely correct statement. You can overoil the filter, and it can cause a code to be thrown - but only until the next restart once the excess oil has been pulled off the filter. The MAF heats that wire - thats how it can tell how much air is moving, the variable resistance as the air cools the wire. K&N did a test where the completely submerged the MAF in oil, and once they pulled it out and hooked it up, it read just fine once the excess burned off. So yes, temporarily you can get a bad reading that will cause problems, but only for as long as the excess oil is still coming off the filter, and it doesnt take long to pull all the excess off at full throttle.

Its still not a good idea to use an over oiled filter, dont get me wrong - but its probably not the OP's issue.

IIRC when my endtank was cracked this was the code it threw, although it threw some other code as well. GM replaced the MAF sensor first, which didnt fix it, then discovered the crack in the end tank.

Since you just had your oil changed, its quite possible they drove it up on the lift (or do they use pits there?), and hit that infamous bar at the bottom of the intercooler. If its loose/hanging down, you have a cracked end tank and I would raise hell with the oil change place.

 

That is a crazy test. I had no idea they did that lol.

 

i just had this code, its ur harness that connects to your maf sensor not the sensor itself one of the wires got loose need to replace the connector

 

Just to update everyone.... they replaced the ECM. This seems to have fixed the issue, no more codes being thrown.