Question about 2003 Hyundai Tiburon

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How long does it take for the emissions system to reset after the battery is reconnected?

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Modern ECM's need to be re-set w/ a diagnostic tool plugged into the 'on-board computer' connection.

Posted on Sep 30, 2009

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Changed brake booster and when I start the van my gages are not working right was told need to reset the computer how can I do this myself


You just disconnect the battery for two hours. This discharges all the power from the computer and wipes out all its memory. Also resets your emissions data and re-pairs the anti-theft system. Make sure your key is in the ignition when you reconnect the battery.

I have to say though, I don't see how changing the braking booster (servo) affects the computer. I wouldn't have thought there were any electronics on it apart from perhaps a brake light pressure switch.

Oct 05, 2016 | Cars & Trucks

1 Answer

Engine light or Drive Cycle Instructions.


Try disconnecting the battery for 10 minutes, then reconnecting.

Aug 25, 2016 | 2008 Toyota Matrix

1 Answer

I replaced the alternator on my 1999 Audi A6 with 2.8 engine. Now the check engine light is on. Was not on prior to the repairn. How do I correct?



Instructions on How to Turn Off The Check Engine Light:
Step 1. If not using a scan tool, locate your vehicle's battery. Disconnect the 12v positive cable (red wire) from battery terminal (+). Leave it disconnect for 5 minutes. While the battery is disconnected, cycle the ignition switch to ON position 3 times. If using a scan tool to turn off the check engine light, follow manufacturers directions. You will need to find your vehicle's OBD II Data Link Connecter (DLC) and connect your scan tool to the DLC, then follow the steps indicated on your scan tool or scan tool manual.

Step 2. Insure ignition switch is OFF. Reconnect the battery 12v positive cable (red wire) to battery terminal (+).

Step 3. Cycle ignition switch to ON position and wait 1 minute, then start your vehicle. Check Engine Light or Service Engine Soon Light should be reset and turned OFF.

Step 4. Drive your vehicle for one week under normal driving conditions. During this period the emissions computer is gathering data and re-learning your vehicle's emissions components and systems. The emissions computer OBDII (on-board diagnostics) system must complete at least one drive cycle (in some cases two or three). A drive cycle is a sequence of internal tests which the emissions computer runs while your vehicle is being driven. This insures all emissions systems are functioning properly. Proper "readiness flags" are set as the computer completes it's cycles. Test cycles are unique to a vehicle. Certain cycles run under very strict parameters, and may require extended driving time to trigger on. Cycle data and readiness flag information is available through your dealership's service department. The data vary widely.

Sep 15, 2014 | 1999 Audi A6

1 Answer

What could cause check engine light to come on after a easy repair? I have a 1994 Saturn SC2 coupe. It was having an overheating problem causing the coolant to project out of the resevoir cap. Turns o


When you remove a battery cable, you loose
(all data) needed to diagnose vehicle problems

Your not resetting anything,your clearing needed
data & freeze frame data, at the time the fault code
codes were set & you loose all emission monitor data

95% of the time, if you have codes, you have not fixed the
problems or the MIL Lamp would go off on it's own

Aug 19, 2014 | 1994 Saturn Sc

2 Answers

Engine Check light


Take it to autozone or another place like it and have them read the codes and tell us what they are.

Jun 19, 2013 | 2011 Jeep Wrangler Sport

1 Answer

2006 ford explorer emissions light on, then my gas cap light came on. I have replaced the gas cap with after market, but has light on. what should I do?


Hello and welcome to FixYa!

You may just have system failure. As a first course of action, I strongly suggest that you remove the positive battery connector and let it sit for at least 5mins. before reconnecting it. This will reset the system and can get your vehicle back to it's normal operation.

This thing really happens and reconnecting the positive battery connector serves like a jumpstart to the vehicle's PCM (powertrain control module).

Hope this helps and thank you for using FixYa! Have a good one!

Sep 18, 2011 | 2006 Ford Explorer

2 Answers

How do i reset computer after repairs. emissions testing says computer hasnt reset the codes.


It is called an OBD2 drive cycle, and it reset the system after the battry has been disconnected or the system power shut off for any reason.
You must follow this procedure very closely to have sucess. The instructions are at the URL link below.
http://www.obdii.com/drivecycleford.html

Mar 25, 2011 | 1996 Ford Taurus

1 Answer

2004 honda odyssey emission light came on after I changed fuse because the cruise control was not working. The fuse was taken out, I started the van (not realizing the fuse was out) and once the car was...


Disconnect the battery and reconnect it. Sometimes this resets the codes. If it comes back on after awhile it probably it the upstream or downstream o2 sensor.

Dec 22, 2010 | 2004 Honda Odyssey

2 Answers

Daughter just bought 96 cavalier...ran outta gas now engine light on..went to auto zone tested it it read emissions vacuum he reset computer said should be fine 5 minutes later light came back on..i...


Replace the gas cap and then either ask the auto zone to reset the computer again or disconnect the negative battery cable from the battery for 1 min then reconnect it.

Nov 30, 2010 | 1996 Chevrolet Cavalier

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