Question about 1999 Buick Regal

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I used a obd2 code reader and i got P0442 which is a EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (small leak) any idea what this could be

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I don't remember the exact code, but try re-tightening the gas cap. Give it at least a full turn (when it starts clicking). Wife had a code that was worded similar on her '01 Monte Carlo. After doing that reset the code and see if it shows up again.

Hope this helps.

Posted on Nov 14, 2009

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It could be anything from a gas cap oring to the evap canister purge vale near the fuel tank. Honestly....if you can get underneath the car and look around and visibly see something then your lucky......only because most small evap leaks are only detected by a fogger...or gasser....which installs into the service port system and the a gas escapes from the failed area....best bet would be to pay for a leak check at an automotive repair facility and repair it yourself when they find it......hope I helped!!!

Posted on Nov 14, 2009

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SOURCE: obd2 reader code po442 evaporative emission

check gas cap and make sure on good, if possible find another one to try on car to see if that works clear codes before trying(take neg cable off battery for approx ten minute) or might have leak in vaccume line or canister

Posted on Sep 03, 2009

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Po442 code reader


no nothing to do with transmission ---its an evap code small leak detected this is the usual check gas cap that its on and tight or replace because seal is shot but the following link explains the other problems with assistance in helping repair problem
http://www.obd-codes.com/p0442

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I checked the codes and one comes up its po446. i dont under stand what it mean so i cant fix it to get the light to go out.


P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:

P0441 Evaporative Emission System Incorrect Purge Flow
P0442 Evaporative Emission System Leak Detected (small leak)
P0443 Evaporative Emission System Purge Control Valve Circuit
P0444 Evaporative Emission System Purge Control Valve Circuit Open
P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission System Vent Control Circuit
P0447 Evaporative Emission System Vent Control Circuit Open
P0448 Evaporative Emission System Vent Control Circuit Shorted
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
P0450 Evaporative Emission System Pressure Sensor/Switch
P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0452 Evaporative Emission System Pressure Sensor/Switch Low
P0453 Evaporative Emission System Pressure Sensor/Switch High
P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
P0455 Evaporative Emission System Leak Detected (large leak)
P0456 Evaporative Emission System Leak Detected (very small leak)
P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0458 Evaporative Emission System Purge Control Valve Circuit Low
P0459 Evaporative Emission System Purge Control Valve Circuit High
---
At least the cap isn't loose for the gas tank.

I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.

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