Question about 1998 Volvo V70

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Error code = EVAP System large leak detected Where do I look, and for what? It's a 98 Volvo wagon

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Well the first thing is to make sure your gas cap is on and tight,next is to check the evap lines for breaks, a large leak would mean a big crack in a line or line off, also the vent valve may not be closing to seal system or the purge valve not operating these car are a little hard to find evap leak without a smoke machine and to test these valve you would need a scan tool or try to power them up to test them but you need to know which terminal is power and ground or you will damage the valve,check the lines in the engine compartment at the rear of raditator for breaks, then you can follow them to tank and check there, the vent valve is inside the driverside wheel well, that hose breaks often, check that also,hope this is helpful.

Posted on May 12, 2010

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EVAP is an emissions filtering and re distribution device taht removes hyrdocarbons and sends them back into the manifold system where they are burnt instead of emmitting them into the atmosphere. usually the EVAP filtering module is a replacable part located underneath the car near the fuel tank and looks like a black box. They are not repairable, only replacable, and the norm is to have a professional do the task since it is connected to the cars computer system and codes may need to be erased from the computer once the repair is made. Hope this helps.

Posted on May 12, 2010

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P0449 and P0455 error code 2008 2wd gmc envoy 30,203 miles


P0449 - Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

Both are refer at EVAP system; other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0446 - P0453 - P0455 - P0456

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.
Causes: most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Hope helps.

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1 Answer

Code p0455 on volvo s70


P0455 OBD-II - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.

Causes: A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Hope this helps (remember to rate and comment this answer).

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Describe your Problemcheck engine light codes p0457 p0455


Trouble code P0455-EVAP Control System Large Leak Detected

Trouble Code Conditions:
ECT sensor less than 90°F at startup, engine running, and the PCM detected several small fuel vapor leaks or a large leak in the system.

Possible Causes:

  • Aftermarket EVAP hardware non-conforming to specifications
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  • Fuel filler cap missing, loose (not tightened) or the wrong part
  • Loose fuel vapor hose/tube connections to EVAP components
  • Purge sensor or FTP sensor is out of calibration or has failed

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the first thin to check is your gas cap

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