Question about 1987 Chevrolet Camaro

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How to reset ecu

Replaced maf sensor now having problems clearing check engine light

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If google cant help, i took mine into dealer, paid 50.00. but now i know how to reset in the future.

Posted on Apr 16, 2014

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Remove ground cable to battery for five min to one hour then reconnet if still on after another problem most likely

Posted on Apr 16, 2014


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Posted on Jan 02, 2017

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SOURCE: O2 check engine light

U may indeed have a faulty MAF or O2 sensor, the way to tell if the MAF or a vacuum leak is at issue is that both O2's will code lean, if only one codes lean then it is most likely just a faulty O2 sensor, I don't have your codes but this is the way we do things at the dealer for problems like yours. Remember the O2's are before the Cat's., after the Cat's they are called Cat efficiency monitors in the book.

Posted on Jan 03, 2009

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SOURCE: trying to locate MAF sensor

Look near your A/C system and under the overflow hose for the coolant. It is a round can looking thing with a small wiring harness attached on top. There rae 3 hex screws holding it on to the bracket. Remove these and slip it off of the air intake tube. Use a small screwdriver to depress the small latch on the inside of the harness and gently pull it off. Disassemble the MAF sensor from the mounting plate, remove it from the vehicle and spray the wires with carburetor cleaner several times. That should clean it up for you. Good luck and let me know if you need more info.

Posted on Feb 16, 2009

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SOURCE: check engine light p0171 system to lean bank one,

o2 sensor replace them

Posted on Jun 13, 2009

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SOURCE: Eratic Ideling and Wants to die, Backfire through Intake.

I also have 2001 S10, 4.3 V6 Engine code W, 4x4, Automatic, 137,000 miles. About 3 weeks ago, I had intake manifold gasket changed and every since then has been doing the same as yours. I suspected that the yahoo who did the gasket change got the distributor in wrong. I had one other mechanic tell me my engine was shot but the distributor , firing order was all right. Then I had another mechanic tell me that the distributor was in wrong and they fixed it but it didn't run any better. They also said the catalytic converter was plugged causing back pressure in engine. This past weekend I cut the catalytic converters (2 of them) off at the y pipe and now the engine will actually idle but still a little rough (and loud) but now the O2 sensors are not able to do their job. They say catalytic converters are only good for about 10 yrs anyway. To get the one piece replacement cats pipe in you have to drop the tranny crossmember, and to drop that it looks like you have to remove the torsion bars or at least one.

Hope this helps.

Posted on Mar 01, 2010

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SOURCE: Check engine light came on

My book says ( GM ) P1133 - HO2S/O2S Insufficient Switching Sensor 1 Or Bank 1 Sensor 1
Be that as it may - to clear the codes in your computer - disconnect the battery for a couple of minutes and see if that clears the codes. Let me know. Thanks

Posted on Jan 20, 2011

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Engine runs rough at idle has a code 0101 and 0113 will stall when put in drive

0101 points to the mass air flow seonsor. 0113 points to the air temp sensor. Check your air intake for blockage, check the filter and make sure it is not overly clogged. IF all those are clear, I would replace the mass airflow sensor before the air temp sensor, as the air temp sensor does not have as much bearing on whether the engine runs well or not.

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clean the idler on the intake and also clean the throttle sensor, it would also be best to change the air filter and clean the maf sensor. Idler does more than just idle vehicle it controls low revs, and drop down from reves. throttle sensor tell ecu what air to add to the fuel. and the MAF tells ecu how much air is coming into the intake. also check for broken cracked vacuum lines.

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Airflow meter or MAF sensor is a must for determining how much fuel injected into the engine to work properly. If you had already replaced the MAF sensor and the problem still presist,I am affraid the problem is not the sensor itself. Check the cable from ECU to MAF sensor for any broken or short circuit.Unplug the connector to the ECU and sensor,spray it with contact cleaner aerosol plug them back while it is still wet. Make sure there is no air leak betwen Sensor and engine due to crack or loose clamp. Replace your air filter. Start your engine. You can also trace possibly problems by OBD diagnostic tool. Good luck.

Jan 10, 2014 | Hyundai Cars & Trucks

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I have a 99 ford contour, my check engine light came on and ran the code p0102 which is the MAF sensor. I replaced the MAF and my car still runs horrible (idles rough and wants to stall around 10% idle)....

Your new MAFS is not plug and play... you must clear all learnt data / fuel trim from ECU

Here is how:

Disconnect battery on + side, hold the + lead to earth (body, engine or chassis) this diffuses the system. Leave disconnected for 10 minutes, reconnect, start car and take on a 12 mile minimum drive (this is know as a drive cycle) pull over safely, switch off engine (new data now stores in ECU), start engine and happy motoring :o)


Aug 18, 2010 | 1999 Ford Contour

2 Answers

What are the MAF sensor computer setting on 1999 cabrio

You might need to simply disconnect the battery for 10 mins and do the usual like set the clock etc afterwards but although the ecu will have stored the code it should start from scratch, first doing a TBA (throttle body alignment) - lots of whirring and clicking, when thats stopped (ign on after reconnecting battery, dont start engine just ign on) the engine will be ready to start and hopefully since all is well the CEL(check engine light) should not come on. At worst, see if someone local has vag com or a hand-held OBD device that can reset the CEL and if it just comes back on, the fault is solid.

Did you mean you connected the original maf back up or a new one? If its the original and the light only appeared after disconnecting it, then the ecu mustnt have realised it was faulty, and only noticed when you pulled the plug, a reset should clear it no problem, but has you original fault returned after putting the maf back on or has it now gone away? Might have been a bad/dirty connection now made good, or if youve cleaned it, and its working fine, the CEL will be a dummy from the time it was removed so reset & your good to go!
many a times while replacing the maf the wires beside the sensor gets disconnected or loose and this makes the check out the wirings. This will help. Thanks please keep updated. please do rate the solution positively .thank you for using fixya

Mar 26, 2010 | 1999 Volkswagen Cabrio

1 Answer

My check engine light keeps flashing. i relpaced the thermostat, egr housing gasket and spark plugs and my car keeps stalling and check engine light keeps blinking

You don't have the right ratio of fuel and air and it is detected through the Oxygen sensor causing the check engine to light up. However it is not necessary to replace the O2 sensor since it is not a source of the problem. The problem is the gunk built-up over time at your throttle valve before the input manifold. Need to have a good cleaning of throttle body and MAF sensor. After that, take off negative battery cable for 30 minutes to reset the ECU so it can start a fresh calculation from your new condition of Fuel: Air ratio input. Good Luck.

Oct 15, 2009 | 2005 Suzuki Forenza

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My Hyundai xg300 downshifts from 5th gear into 3rd gear. We have changed the mass air flow sensor and some other sensor that is attached to the transmission. We never wash the engine so it's not water on...

Yeah... why did you change the MAF?... Someone tell you the MAF caused your transmission to shift from 5th to 3rd?... I don't think so!
Did the 'Check Engine' Light come ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.

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Check engine light on a 2001 Toyota Corolla

No need to replace the MAF. If it was bad, the check engine light would have come right back on as soon as you started the engine. The MAF not only measures the air going into the engine, but also measures the air temperature. Those 2 circuits are constantly sending info the the ECU. If either would fail, the ECU would light the check engine light. P0171 is a common code for incorrect readings (dirty) in the MAF. Cleaning it always helps, and cuts off the light. Your acceleration problem may be either a wrong Air-Fuel sensor (the one before the cat), or an "aftermarket" AF sensor. "Aftermarket" AF sensors have been shown to not work properly in Toyota vehicles. Hope this helps

Sep 27, 2008 | 2001 Toyota Corolla

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