VW N80 Purge Valve for Optimal Engine Performance: P0441 P0444
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Fuel vapor from the tank is stored in a charcoal canister. The purge valve (N80) is the electrically controlled valve that lets the running engine draw that stored vapor into the intake and burn it, instead of releasing it into the air. It is also called the canister purge valve or EVAP purge valve. The purge valve on Volkswagen vehicles is part of the Evaporative Emission Control (EVAP) system and can fail. Failures are common enough that Volkswagen has addressed the N80 in technical service bulletins. This guide provides a step-by-step procedure to diagnose a Volkswagen Jetta equipped with a bad purge valve. We will look at the Diagnostic Trouble Code set by a defective evaporative purge valve on a VW, its symptoms, and where the purge valve is located.
At a Glance
- What N80 does: it lets the running engine draw stored fuel vapor from the charcoal canister into the intake to be burned.
- Location: on top of the engine, generally on the passenger side near the intake, on the Jetta, Golf, Passat, CC and Eos.
- Symptoms: check engine light, rough idle, hard starting after refueling and higher fuel use.
- Common codes: P0441 and related EVAP codes.
- Check the hoses between the tank breather and the throttle body before replacing the valve.
In most cases, the only symptom that the driver will notice is the check engine light stays on. Fuel consumption may also increase, but other symptoms, such as rough idle and engine-struggling start, are much less likely.
The evap purge valve is a “normally closed” or always closed valve. This opens when commanded by the Engine Control Unit (ECU) to purge the excess fuel vapors from the charcoal canister into the intake manifold. The engine computer also opens it during the EVAP self test, when the system is checked for leaks. When it fails, it causes fault codes such as P0441 or P0444 or other codes related to “evap system malfunction,” which can point to a faulty N80 valve.
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VW N80 Purge Valve Location
On Volkswagen Jetta, Golf, Passat, CC, Eos, etc., the purge valve is mounted on top of the engine, generally on the passenger side near the intake. the image features the evap purge valve on a 2016 Volkswagen Jetta fitted with a 1.4 turbo engine.
The purge valve on this Volkswagen, equipped with a 2.5L engine, is on top of the engine on the passenger side.
Symptoms
Here are a few symptoms you may notice when the Volkswagen purge valve is bad:
- The check engine light on
- Increased fuel consumption
- Rough idle
- The engine struggles to start.
- A decrease in engine performance
Possible Causes
- Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty/jammed
- Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty/jammed
- Evaporative Emission (EVAP) Canister Sealing faulty
- Pipes between the Tank Breathing and Throttle Body are leaky/blocked.
Replacement
Troubleshooting
- Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
- Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)
- Check Evaporative Emission (EVAP) Canister
- Check Pipes between Tank Breathing and Throttle Body
The YOUCANIC UCAN-II Pro can read and clear fault codes on all control modules.
Fault Codes
- P0441: Evaporative Emission System Incorrect Purge Flow
- P0442: Evaporative Emission Control System Leak Detected (Small Leak)
- P0444: Evaporative Emission System Purge Control Valve Circuit Open
- P0455: System Gross Leak Evaporative Emission
- P0456: EVAP System Leak Detected (Very Small Leak)
- P0496: EVAP Flow During a Non-Purge Condition
Stuck open and stuck closed behave very differently
Knowing which way the valve has failed tells you what to expect and how urgent it is. A valve stuck closed traps fuel vapor in the charcoal canister. The engine runs normally, nothing feels different from the driver’s seat, and the only sign is the warning light with an EVAP code stored. It will fail an emissions test but it is not doing any harm in the meantime.
A valve stuck open is the one you notice. It lets the engine draw fuel vapor continuously, which behaves like a vacuum leak: a rough or hunting idle, stalling as you come to a stop, and the symptom that identifies it on a Volkswagen more than any other, a very hard start immediately after filling the tank. If the car cranks and cranks only at the fuel station and starts normally everywhere else, suspect this valve before anything else.
Do not assume the valve is the cause of an EVAP code
This is where money gets wasted. Codes such as P0441 and P0455 describe incorrect purge flow or a leak in the evaporative system, and the purge valve is only one of several things that produce them. Before replacing it, check the fuel filler cap and its seal, since a cap that no longer seals is the single most common cause of an EVAP leak code and costs almost nothing to replace. Then inspect the vacuum hoses running to and from the valve, which go hard and crack with age on these cars, and the charcoal canister and its lines underneath the vehicle.
A code that specifically names the purge valve circuit, such as P0443 or P0444, is pointing at the electrical side of the valve, which is a different matter and can be confirmed with a multimeter at the connector.
After fitting the valve, clear the code and then drive the car normally for several days before deciding whether the repair worked. The evaporative system only tests itself under particular conditions of fuel level, ambient temperature and steady cruising, so the monitor may need a number of trips to run and confirm. A full system scanner shows readiness monitor status and can command the purge valve open and closed on demand, which proves the repair immediately rather than leaving you waiting for a drive cycle.
Frequently Asked Questions
How much does it cost to repair the purge valve on a VW?
The purge valve is straightforward to replace. Replacing it on a Volkswagen usually takes less than one hour. Volkswagen dealers or auto mechanic shops charge around $180 to $300. If DIY, the average replacement parts price is between $30 and $90.
Can you drive a VW that has a bad purge valve?
While driving the vehicle with a bad purge valve is possible, we do not recommend doing so for an extended time. Your vehicle no longer meets the emission standards.
Does my VW have an EVAP purge valve?
Yes. Around all Volkswagen vehicles with gasoline engines started in 2000 and later had a purge valve. That includes the VW Jetta, Atlas, Bora, Passat, Golf, CC, and EOS.
How do you test a VW purge valve?
The easier way to test a VW control purge valve is to see if it opens and closes when you supply power. Use a pair of clips to connect 12 volts to it. You should hear the valve operate. Further, you can test if the purge valve opens and closes by blowing through it as you switch the power on/off.
Where to buy the Volkswagen purge valve?
Buy against the part number rather than the model name, because the valve changed across engine families. Bosch manufactures the original equipment valve, and one of the most common is Bosch 0280142431, which matches Volkswagen part 06E906517A. Check the number molded into your existing valve before ordering, since a 1.8T, a 2.0 TSI and a 2.5 five cylinder do not all use the same unit. This is an inexpensive part, usually somewhere between twenty and sixty dollars, and it is one where the original equipment Bosch valve is worth the small premium over an unbranded copy.
