Question about Cars & Trucks
Car codes a p0102 mass low circuit been replace and reset Car runs fine but service light and check engine light stays on
Is this a DIY question, do say.?
still 102? you didnt say. post all DTCs
live, stored and pending.
use a real scan tool , in usa?)
Mass Air Flow (MAF) sensor or circuit
Read more at: http://www.obd-codes.com/p0102
this is the AIr meter (measure air mass not volume)
it reads low, but can be caused by.
1: air leaks (aka vacuum leaks) in the whole induction system.
from air meter , to the intake valves. the whole path !!!
2: too low idle speed, 800 is par. if lower fix that now.
the test is simple. using a voltmeter to see if the air meter is really bad. boy scout simple.
ask for the tests.
or login to
and read 102 then when there, go to MAF page and read that page
it shows the simple tests. (the saturn FSM does too)
im not sure the defunct Saturn co. uses PCM. if it does, its hopeless.(DIY)
most MAFS are analog and any cheap meter works, any.
PCM is modulated, (a ford trick. to avoid.)
I check my MAFs. from keyon,, then start
then racing in idle to 3000 RPM
and if a A/T , i do a A/T tranny stall RPM test. (see tranny tests)
as the same time, this act puts huge load on the engine.
(a free dyno) for 5 seconds max, (overheats tranny the trannysections say that, and is true. read it.
then see output of MAF hit near 4v. this is a good maf.
can elaborate and show pages doing all this and more.
just ask, if all that is too hard,
find an ASE mech, he knows how to do this.
keep in mind no ECu on earth knows what is wrong,
it only can report bad tests. NEVER WHY!
Only the mech finds the truth. by adding more tests.
Posted on Oct 15, 2013
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Posted on Jan 02, 2017
SOURCE: PCM code P0404
P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance
I suspect the EGR got stuck closed, u will need to put around 30 miles on the car before the light will return if the problem is still present..
Posted on May 26, 2009
Higher octane gas 93 with some good octane boost in the black can at autozone cost about 7 dollars or a bottle of 104 octane boost. Change the fuel filter. Probably only one coil pack is bad. The OBDII reader should tell you which one was a misfire.
Posted on Jul 15, 2009
Most faultcodes don't disappear automaticly, the have to be 'reset' manually after repairing. It sounds like the code didn't get erased after replacing the MAF. You could try to disconnect the battery for 10 minutes (disconnect and reconnect the negative (-) pole), which should erase the code.
Whenever the engine light still comes back on after that, there probably still is some (other) problem ...
Posted on Aug 24, 2009
Hi, Since you have both codes Fuel system lean and MAF low I would bet money on that you have an intake air leak after the throttle. Check all hoses connected to the intake manifold, gaskets, injectors are put in place etc.
Posted on Dec 16, 2009
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