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The "Service Engine Soon" light

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These are both EVAP emissions codes. The first thing I would do is open the fuel door and take a good wiff. If you smell gas replace the fuel cap.

If you don't smell gas the next thing you can do is visually inspect all the EVAP hoses and lines for cracks or holes. The EVAP system consists of a purge solenoid, a charcoal canister, a vent solenoid, a fuel tank pressure sensor, and misc. lines and hoses. All of these will need to be visually checked for damage.

If you don't see anything with a visual check than the next step would be to have the EVAP system smoke checked for leaks. A smoke machine will be used to slightly pressurize the EVAP system with smoke. Where ever the smoke comes out is where is is leaking.

Posted on Mar 19, 2011

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My trailblazer was ibeling then it died when I started it up it was missing and service engine soon light flashes on an off none stop


Your vehicle has a bad misfire that could damage the catalytic converter. That's why the service engine soon light flashes . If you drive it like that it will damage the cat. Have towed to the repair shop . Flashing Check Engine Light CarMD

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How to reset Service Engine Soon light after replacing gas cap? Took to AutoZone when the Service Engine Soon light came on Error code P0440.


Disconnect the negative battery cable for 30 minutes. Reconnect after and the code will clear. However if the problem persists, the code will come back with in 20 miles or 30 minutes.

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1 Answer

PO440


http://www.obd-codes.com/p0442
P0440 indicates the failure of the EVAP system to develop proper vacuum. If you got
and replaced a proper good quality gas cap, you have corrected the most common cause.
However, in fully searching the causes of this code (http://engine-codes.com/p0440_chevrolet.html ) (pardon the generic GM info, but will apply for you)-----you will find there are 5 other causes of the vacuum failure, which are independent of the gas cap. Your good local mechanic can sort those out; I would save your gas cap
receipt if you were advised to buy one not needed. As you probably know, your
State emission test facility checks your gas cap----so that is another way to find that specific portion of this answer,
(for their fee).
P0300 is a generic misfire code. For this, a specific Cadillac forum may be most
helpful = 2001 Deville intermittent service engine soon light code P0300
co-logo-100x100.png 2001 Deville intermittent service engine soon light code... I recently bought this car from an owner who took decent care of it but a week after i bought it, the service engine light appeared. After a few View on www.cadillacforums... Preview by Yahoo You will see that this generic code is perhaps more serious, costly, and harder
to track down than the P0440. You will also discover that P0301 is cylinder 1 misfire, P0302 is cylinder 2, and etc, etc. If you get a good diagnostic, they will generally
be able to localize the problem fairly specifically---and get a more specific fix. The person who reported this code was unhappy because he was given several ($$) fixes,
before he got one that erased the code, and was a solution. (Be forewarned ----A generic misfire can have umpteen issues--or one! !; use your own local preferred method for solving this with a mechanic who gives you good service, and stands behind what they do.)
2001 Deville intermittent service engine soon light code P0300

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2 Answers

How do you turn off the service engine soon light on panel


No , no joke ! a leaking gas cap can cause a code for the evaporative emissions system and turn on the check engine light . This EVAP system stores fuel vapors in a charcoal canister that the PCM - engine computer will purge at certain times . But that doesn't happen that much . Most of the time it is other componets That cause the leak ! Plus there are other thing's that will turn on the serviced engine soon light ! Your vehicle can set hundreds of DTC'S - diagnostic trouble codes . If the light is on there has to be codes stored or a problem with the instrument cluster . Your best bet take it to the dealer !
Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

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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.

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1 Answer

Code p0442 nissan altima


this is an obd2 trouble code table, it can help you understand the meaning of code.

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Engine light codes p0440,p0442-found a fuel leak on left top side of engine,has a vacuum hose hooked to it is this the fuel pressure regualator?


P0442 Evaporative Emission Control System Leak Detected (small leak)
P0440 Evaporative Emission Control System Malfunction

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