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2002 VW Golf GLS check engine light reset?

Just replaced the catalytic converter and PASSED SMOG! But the check engine light stays on. Bug washer bottle has a leak and is empty now. No problems with driving (had it on the road for 250 freeway miles after CC was replaced and smog passed). How do I reset CEL to see if it still shows a problem?

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  • Cars & Trucks Master
  • 5,371 Answers

Codes and the CEL can be erased with the same scanner used to retrieve the codes. It is a separate function of scanners.

Posted on Jul 23, 2013

  • Barry McCown Jul 23, 2013

    Monte: Thanks for the tip. Friend (owns a shop, but works on Japanese only) is pulling the codes tomorrow and we'll get them reset to see if

  • Barry McCown Jul 23, 2013

    . . . CEL lights up again. Thanks ever so much.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: The check engine light stays on or comes back on

Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
copyscape.gif Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:

  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Posted on Nov 20, 2009

  • 6982 Answers

SOURCE: didnt pass smog i replaced catalytic converter,02 ...

Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Good luck!

Posted on May 24, 2010

  • 149 Answers

SOURCE: I have a 2001 VW golf that I just bought. It

if the code is p0420
it means
catalyst system efficiency below threshold
(cylinder bank no.1)

Posted on Aug 21, 2010

  • 29 Answers

SOURCE: honda passport 1994 4wh drive

Here are a few things to look at:
Have you replaced the air filter? Have a compression test done on the engine, could possibly be a leaking vale. If any vacuum hoses have been removed from the engine they will have to be re-installed. Solid Lifters out of adjustment can cause incomplete combustion. Make sure engine is reaching proper operating temperature (eg. thermostat). Do not use low grade (octane) fuel for test.
Clean oil, tire pressure, brake drag?, every little thing counts.

Posted on Oct 12, 2010

tunde007
  • 2382 Answers

SOURCE: driving code to reset OBD

Hi, remove the positive terminal cable from the battery using your pliers or wrench.

Go to your fuse box in your car, and look at the diagram. Select the fuse that is labeled "ECM" and remove this fuse. Sit the fuse aside for now.

Keep the car disconnected like this for two to three minutes to clear the computer's memory.

Insert the fuse back in to the box. Reconnect the battery terminal. Your car should now be reset.

Posted on Apr 09, 2011

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Since you haven't given a lot of detail here, there's no way to really know whether the transmission will be damaged or not. The real question is what exactly is wrong. Just because you get a code for one issue doesn't mean another issue isn't causing it. I am assuming "cat" refers to catalytic converter. This type of code would tell you the O2 sensor is out of range or the converter is clogged. A clogged converter drastically effects fuel mileage and performance.
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The check engine light stays on or comes back on when doing smog test. It passed everything on the smog test except check engine light. The indicator code is P0446.


Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
copyscape.gif Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

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