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I have a check engine light on, says evaporative emission leak detected ( small leak ). Car is a 2001 oldsmobile alero. Where would I look to fix this issue?

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  • Cars & Trucks Master
  • 1,209 Answers

Believe it or not, your fuel cap. The fuel system is designed to be pressurized and due to age and constant removal and re-installation your fuel cap will bleed off pressure after time. Replace the fuel cap, reset the engine light, and be sure you tighten the cap till it clicks at each fuel up. You shouldn't have anymore problems.

Posted on May 02, 2013

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Check Engine Light - Code numbers P1486 & P0455

Found on my jeep that the high quality vac line to the evap bottle had split on the under side.

Posted on Sep 03, 2008

johnny5846
  • 379 Answers

SOURCE: 2002 chrysler neon error code p0456

a small evap leak is often interpreted as a loose gas cap , which it can be , it means the evap systems integrity has been breached , it can be an electrical solenoid , switch or just a vacuum line in the system . a bidirectional scanner can run the evap test after checking the gas cap , most well equipped shops can hook up a smoke machine to the evap system service port and run the smoke test , it there is a leak you will see the smoke , makes the diagnosis quickly . get an estimate from a reputable shop , by the way this problem has no effect on drivability , but should be fixed . cheers

Posted on Jan 13, 2009

  • 90 Answers

SOURCE: 2000 oldsmobile Intrigue V6

This could be a # of problems but try these: Remove gas cap and carefully inspect it and the fuel filler neck for small cracks and/or distortion/dirt. Under the hood there is a small green cap which is the test port for the evap system, remove it and check the schrader valve to be sure its tight ( left hand threads!!!). Check all hoses attached to this for cracks/breaks.Other than this a diagnostic will have to be ran with a smoke machine to pin point leaks or valve/switch/solenoid/canister failure.

Posted on Jan 14, 2009

motor1258
  • 6674 Answers

SOURCE: OBD codes 442 & 455

Check all of your EVAP lines and the charcoal canister. Also check the lines and overflow line from the gas cap to the gas tank.

Posted on Jun 12, 2009

  • 12650 Answers

SOURCE: Evaporative Emission System codes

check ur gas cap for tight and proper seal that is the most common problem for the the evap codes if cap is good check fuel and vent lines for damage or leaks from gas cap under vehicle up to engine compartment

Posted on Oct 18, 2009

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Have replaced 2 solenoids near engine, is there a 3rd underneath car?


There is a vent solenoid under the vehicle near the gas tank on the evaporator canister or charcoal canister An your replaced one near the engine you didn't need to. Only 1 on or near engine ( purge solenoid ) But there is also the possability the gas cap leaks , the fuel filler neck is rusted somewhere , or one of the hoses as a pin hole . You could replace all the solenoids an still have the code come back. The best way to trouble shoot these type problems is hook up a smoke machine an smoke the system . Your best bet would be to take your vehicle to a qualified repair shop. I mean unless you like spending money needlessly .
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected.To aid in locating intermittent leaks, use the J 41413 EVAP Pressure and Purge Station to pressurize the EVAP system. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.

Jul 16, 2016 | 2000 Oldsmobile Alero

1 Answer

Have OBD codes P2A00, P0441, P0442, P0446 on my 2003 Highlander. Selling the car in a few months. Does this really need to be repaired before trade-in? Can I just erase the codes?


NOPE CANT ERASE CODES UNTIL THE PROBLEM IS FIXED OR THE SERVICE ENGINE LIGHT SOON WILL STAY ON. CODE PO441 - EVAPORATIVE EMISSION EVAP SYSTEM INCORRECT FLOW DETECTED.CHECK INTAKE VACUUM HOSE CONNECTIONS AT THE EVAP CANISTER PURGE VALVE.IF ALL IS GOOD.THE EVAP CANISTER PURGE VALVE COULD BE BAD. CODE PO 442 - EVAPORATIVE EMISSION EVAP SYSTEM SMALL LEAK DETECTED. EVAPORATIVE EMISSION SYSTEM LARGE LEAK DETECTED FUEL CAP LOOSE OR OFF MISSING. CODE PO 446 - EVAPORATIVE EMISSION EVAP SYSTEM VENT CONTROL CIRCUIT MALFUNCTION.

May 21, 2011 | Toyota Highlander Cars & Trucks

4 Answers

Hi I have a Dodge Neon 2003 with engine codes P0456 and P0440. What do these mean and how do I fix them


P0456....Evaporative Emission Control System Leak Detected (very small leak)


P0440....Evaporative Emission Control System

Nov 12, 2010 | Dodge Neon Cars & Trucks

2 Answers

What does po440 on a 2003 saturn vue mean with a service engine soon light on


That is a problem in the evaporative emission control system.
Could be anything causing it
Clogged filter in the charcoal canister
A leak in one of the vacuum lines
The purge valve not working,,,etc.
The best thing is to take it and have it checked out, they might have to do a smoke test to find the problem.
All they do is inject smoke into the system, if there is a leak the smoke will come out of it. All it takes is a pin hole in these emission systems to screw it all up.

Aug 13, 2010 | 2003 Saturn VUE

2 Answers

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.

Aug 06, 2010 | 1996 GMC Jimmy

1 Answer

Engine coad po442 how do i fix it


PO442 is the data trouble code for (evaporative emission control system leak detected "small leak") it means that the OBD-II system has detected a small vacuum leak in the evaporative control system.

You will need to find the vacuum leak in the evaporative control system, check for cracked or broken vacuum lines and hoses, especially the vacuum hoses and lines around the evaporative (Evap) canister and the (Evap) solenoid. Also check the gas cap seal for damage.

Vacuum hoses and lines should be checked very well for any cracks or breaks, because they usually hide under the vacuum line or hose.

May 02, 2010 | 2001 Dodge Durango

1 Answer

My check engine light on my 2001 hyundai accent gl reads code po441, po442. What does these codes mean?


Most of the time they mean:
p0441 = Evaporative Emission System Incorrect Purge Flow
p0422 =
Evaporative Emission Control System Leak Detected (small leak)

MOre info at http://www.obd-codes.com/p0442

Jan 10, 2010 | 2001 Hyundai Accent

3 Answers

What is a p0440 problem?


Hi there,

Oldsmobile code P0440 refers to: Evaporative Emission System

This means there is a problem with the Evap System, and you will need to inspect the related components:

- Purge Solenoid:

Related Symptoms
  • Stalls after start with a hot engine
  • Poor Fuel economy
  • Emission related faults
- Evap Canistor: Check evap canistor for loose carbon.

- Evap Canistor Vent Valve:

Related Symptoms
  • Poor fuel economy
  • Stalls after start
  • Emissions related failure DTC codes
Hope this helps...

Cheers,

Nov 12, 2009 | 2001 Oldsmobile Alero

1 Answer

Having the same problem the other guy described.


First of all, these codes are what are called "Powertrain Trouble Codes' (that's what the "P" means P=Powertrain). TCM Request (Transmission Control Module = TCM). The request was to turn on the 'Check Engine" light.
P0720 - output speed sensor circuit malfunction
P0715 - Input speed sensor (turbin speed) circuit malfunction
P0442 - Evaporative Emission System Leak (Small Leak)
P0455 - Evaporative Emission System Leak (Large Leak)
Check fuel filler cap problems - for Evap Emiss leaks
Replace the pulse generators & have the trans fluid replaced/flushed.
The Main Catalyst System Efficiency Bank 1 Is P0420, not P0442
If you had P0420 code, the catalytic converter is shot... and that's an expensive component.

Oct 06, 2009 | 2001 Hyundai Elantra

1 Answer

Diagnostic code p0442


Hi, a P0442 is Evaporative Emission Control System Leak Detected (small leak). Start with the simplest thing first, make sure the gas cap is on tight. If it is, replace it with a new GM part (not a cheap aftermarket one). If that doesn't fix it, there are more steps listed here:
http://www.obd-codes.com/p0442

Jan 03, 2009 | 2003 Oldsmobile Alero

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