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SERVICE ENGINE SOON light came on 1 week after passing the PA emission test. Gas cap was on tight (1/4 tank of gas when this occurred, tank filled since with no change)Car continues to perform normally (i.e no rough running, no hesitation or rough shifting)3.3 L, 125,000 miles.

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Why could my service engine soon light be on?

The service engine light is usually a cover-all light for your emissions control system. Anything that does meet the exact operating parameters of the engine computer turns this light on. Depending on the state you live in, it will also prevent you from passing your emissions test.
Remedy is to have a service station connect the computer to it, wherein it will read the offending code, and tell them what is out of whack and what needs fixing. Could be serious, could just be your gas cap is loose (yes, it measures the vacuum on your tank).
Good luck.

Mar 19, 2015 | Cars & Trucks

2 Answers

1st code p0440, then code p0453 then p0452 now p0446

This problem is out side the gas tank , has nothing to do with the fuel pump or fuel level sending unit inside the gas tank .DTC P0446 EVAP Vent Solenoid Valve Control System . Do you know anything about automotive evaporative emission system ?
Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid Open and the EVAP canister vent solenoid Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid Closed and the EVAP canister vent solenoid Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inches H2O in a calibrated time, this DTC sets.

Mar 13, 2017 | 2000 Cadillac DeVille

3 Answers

What is code PO496 and PO455 for a 2007 Pontiac Grand Prix mean

P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

Jan 24, 2012 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

What does it mean when the emissions light comes on in your instrument panel? the emissions light came on tonight while driving home I checked my gas cap to make sure it was closed tight and made sure that...

It could be emission related- the gas cap may be on tight but how about when you filled up before?And the cap can actually be bad - meaning it allows to much fuel vapour to escape. Your cap actually has to pass a pressure test during a drive-clean inspection. If your not due for a e-test then you may remove the gas cap and bring it to a drive-clean facility for a pressure test, usually it`s a no cost.If your cap passes then the problem can be related to your emission system on your car which consists of valves, solenoids and plastic vapour lines. Your auto repair shop can diagnose this for you. Either way you are not in any danger if you continue to drive your car.

Feb 18, 2011 | 2005 Chrysler PT Cruiser

1 Answer

Yesterday I noticed, on my 1997 Honda Del Sol, that the CHECK (yellow) lamp came on. I immediately checked my manual and it stated it had to do with my gas cap. The last time I got gas was about two...

the vehicle randomly runs a test on the vehicle to test the emissions, if the cap was loose it will trip the light. if it is tight the next time it runs the test it will turn the light off.

Apr 18, 2017 | 1997 Honda Civic del Sol

1 Answer

Recently my check engine light came on. When I had it checked I was told that it was something to do about gas, the technician said many times it is just a loose cap, which he said seemed to be on tight....

when you next fill up with gas,turn the cap till it clicks about 6/7 times.AND DONT WORRY, S..T HAPPENS.what is murphys law......"if it aint fixed dont break it.... "

Sep 28, 2010 | Ford F-150 Cars & Trucks

2 Answers

Check fuel cap light on

It is the fill pipe rubber seal

Mar 15, 2010 | 2002 Ford Mustang

2 Answers

I Own 98 dodge Dakota check Engine light, code PO 442 Evap Emission Control System Leak (small). Gas fill pipe is rusted, Should flapper hold back air with gas cap removed?

No the flap inside the fuel filler pipe is just an anti theft device to make it more difficult to siphon fuel out of the tank. The most likely cause for the code it the fuel cap itself. If you don't get the gas cap tight after you fuel up, it can set a computer code and turn on the Check Engine Light. After you check to make sure the cap is on tight, clear the engine code and see if it comes back on. If it does then have the fuel cap tested to make sure that it doesn't have a vaccuum leak.

Aug 27, 2009 | 1998 Dodge Dakota

3 Answers

2002 kia rio rxv check engine light came on again..

the check engine light is not caused by any wrong fluid level or dirty air filter or anything else like that, it is caused by well over 100 faults that can occur in the computer controlled electronic engine and emission controls, u will need to go to a Kragen or Autozone parts store and get a free OBD 2 fault code test to get the code that set your light.

Feb 17, 2009 | 2002 Kia Rio

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