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Code P0102 - MAF Sensor Low Input

91iroc's Avatar
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Join Date: Oct 2007
Posts: 21

March 13th, 2010, 3:52 PM   #1  
Code P0102 - MAF Sensor Low Input

Hi everyone,

I'm looking for some help. I have a 2001 Impala (3.4L) that started throwing a check engine light accompanied by a p0102 code a couple months ago. Realizing it wasn't serious, I decided to wait until the weather got better to try and repair it. Since its been nice outside the last few days, I picked up a replacement MAF from a local parts yard and installed it. After I cleared the code and restarted the engine, the check engine light and the code came back.

So...either I have a faulty MAF from the yard or something else is wrong - my guess is the latter. I'm assuming that a wire must be broken somewhere, but I have no electrical drawings for that circuit - can anyone provide one?

Also, I've checked the voltage between the orange and black wires on the connector and I have about 14.4V - which seems right, but I have no way to check the voltage on the yellow wire (which I assume is the output). Any ideas what to do next??? I'd appreciate any help.



maxxman04's Avatar
CF Veteran

Join Date: Dec 2009
Posts: 1,852

March 13th, 2010, 3:57 PM   #2  
you might try just cleaning it. parts stores carry a special spray cleaner that won't mess up the sensors. it could just be dirty.

91iroc's Avatar
CF Beginner

Join Date: Oct 2007
Posts: 21

March 14th, 2010, 3:04 PM   #3  
Thanks for the input, but I don't think it's dirty. I've had it all apart and it looks really good. Plus, both my original sensor and the one from the yard are giving me a reading of 0.00V according to my OBD2 scanner.

I'd really like to get my hands on a wiring diagram so I can check if the output wire is broken. I recently had the head gaskets replaced and the problem showed up shortly I'm concerned that the harness may have gotten damaged when the engine was dropped out.

bo5co's Avatar
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Join Date: Apr 2010
Posts: 5

May 17th, 2010, 3:47 PM   #4  
Hi Shawn,

Were you able to track down your issue? I have a 99 Suburban throwing the 0102 and want to dig up as much info as possible before tossing new parts at it ;-)


HotSauce6226's Avatar
Impala Super Moderator

Join Date: Jan 2008
Posts: 791
Shelbyville, KY

May 17th, 2010, 4:10 PM   #5  
couple of things you can do are take a look at all the wires and make sure they are in good shape. You can also invest in a can of CRC MAF cleaner and carefully spray down the wires in the MAF and see if that makes a difference

nj85z28's Avatar
Senior Site Administrator

Join Date: Apr 2010
Posts: 1,126
Vernon, NJ

May 20th, 2010, 12:42 AM   #6  
I had traced down a code 0102 on a 98 GTP a few weeks ago. Turns out the wiring was damaged. Behind the filler neck for the radiator they pinched the wire so badly it was broken and throwing 2 Oxygen sensor codes and the low MAF voltage code.

I would start by tracing the wires from the maf through the loom and look for physical damage.

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