Question about JET Performance 1999 Pontiac Grand Am Mass Air Flow Sensor

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Check engine light stays how to get it out

What makes the check engine light stay on, even though i've fixed oxygen sensor, knock sensor,gasket filter, what else can i do?

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  • 76 Answers

You must clear the code . It can be cleared with an OBD2 code reader and some vehicles will clear by leaving the battery cable off for a while.

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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1 Answer

What causes the check engine light to stay on in a pontiac grand am se


Maybe get a techy to get into reset computer to tell it these things have been done. When ever I replace brake pads have to reset computer because it says ABS, Trac is outa wack when they are not

Dec 28, 2013 | JET Performance 1999 Pontiac Grand Am Mass...

1 Answer

Check engine light stays on and i've had oxygen sensor, knock sensor, gasket filters,


you need to have codes pulled and go from there... or you can waste a load of money by replacing every sensor on it

Dec 28, 2013 | JET Performance 1999 Pontiac Grand Am Mass...

2 Answers

Check engine light on but no codes


The check engine light will come on when the ECM detects knock, it will only stay on if excessive knock is detected. I would replace the fuel filter and check your fuel pressure.
Could also be a bad knock sensor as the ECM will also advance the timing to make the engine knock. If on knock is detected when the ECM is doing this it will light the check engine light.

Apr 18, 2017 | 1987 Chevrolet Suburban

1 Answer

I have a 97 Acura RL,engine light stays on even after O2 sensor is disconnected.I've changed out plugs& checked omhs on coils.Did a compression check on cylinders, 50-80.Do have oil on plugs,


To review, the check engine light will stay on until the problem is fixed and the code or codes are erased. And if the O2 sensor is disconnected the light will stay on for sure.
Do you have the trouble codes stored in the computer ?
FYI - the cylinders should have over 100psi of compression.

Sep 16, 2012 | Cars & Trucks

2 Answers

Check engine light was on. Connected scan tool, got data below and cleared faults. drove car 5 miles, check engine stayed off. p0300 random multiple misfire detected p0325 knock sensor 1 circuit...


If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.

Mar 25, 2011 | 1997 Cadillac DeVille

1 Answer

I have a toyota mr2 turbo 1992 and have a problem with the check engine light me and my dad did a diagnostic test and found out it was the oxygen sensor, we changed the sensor but the light stayed on.


Have you tried to disconnect the battery for a while, since you changed the Oxygen sensor? The light won't just go out by itself, even though you most likely fixed it. If you clear the code, and it comes back, then you need to dig deeper!

Oct 04, 2010 | 1992 Toyota MR2

1 Answer

Engine management light stays on car dries great been well serviced no unusual knocks


something like O2 sensor will cause the check engine light stay on, not too worries,or you may take it to dealer did a service.(the light may stay on on that year model even after service.)

Jun 03, 2010 | 1994 Volvo 850

1 Answer

I have replaced all 4 ox senors before I replaced intake man. gaskets. It is a 97 chevy W/Truck with a V6 auto, auto trans. 2WD. now service engine soon light came on after about 200 miles, it will go off...


First did you clear all the fault codes after your repairs? The reason I ask is po131 is bank one oxygen sensor, po174 is engine lean from faulty oxygen sensor, and po171 is engine lean condition, possibly from vacuum leak (intake manifold gasket?), pcv valve,etc. To check for vacuum leak at intake, start engine and gently spray starting fluid around intake gasket. If rpm raise slightly while doing this then there is a vacuum leak(stay away from air filter intake and housing though), and the gasket will need to be replaced again.

Jan 09, 2010 | 1997 Chevrolet C1500

1 Answer

2001 Nissan Maxima service engine light stays on code from Auto Zone scanner is PO139 and PO138. What should my next step be to solve this problem.


code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

Nov 16, 2017 | 2001 Nissan Maxima

1 Answer

Check Engine Light?


there are 3 one on each side of eng. on the Y pipe one behind the cat. convertor. not to hard change

Oct 21, 2008 | 2004 GMC Envoy

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