Question about 2006 Subaru Outback

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My 1999 Subaru Forester has a P0440 error code for the last 8,000kms. I've replaced the tank filler cap but still the error returns after 230is KMS when I erase the code. My thoughts are either the sensor is bad or there could be a leak in the filler pipe vent tube. I cannot smell gas odours so I think it might be the sensor. Where is the sensor, is it acessable from inside the vehicle or do I have to drop the tank to change it? Thanks Guys

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MY 1999 SUBARU OUTBACK check engine light is on with the code p0440 how do I repair thismalfunction

Posted on Jun 22, 2010

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It depends on the error code(s) being reported. A very common one (P0457) is that the engine computer thinks the gas cap is loose. The gas filler neck often develops rust holes which cause this code, fix is repair usually quite easy, or replace. There are many other error codes. Look around your area for a Subaru shop other than the dealer. Your problem fix may much simpler and cheaper than the dealer, who often give the most expensive, worst case, repair options.

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I have a Subaru Impreza 1989.. I'm having problems


Sometimes a faulty gas cap can set this code. If you ever replaced the filler cap with an aftermarket cap, get an oem gas cap from Subaru. If that isn't the problem, a shop could run a smoke test of the evap system to look for a leak. Fuel vapors are escaping from the evap system somewhere between the gas tank and the charcoal canister and the engine. If you can smell gas at times from front or back of car it may help you to start looking for the leak, but a smoke test is often required.

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I HAVE CODE 0440 MY SERVICE SOON LIGHT ON I FIX FUEL CUP BUT STILL ON LIGHT WHAT TO DO


P0440 - Evaporative Emission Control System Malfunction
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
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In the solution for the po440 code on the 2001 toyota camry ce, what's a filler cap?


The filler cap is the GAS CAP. This code will come on if you forgot to tighten ( or drove around with it hanging) your gas cap after filling up the gas tank. If this is the case then all you have to do is tighten the gas cap until 3 clicks are heard. The code will reset itself after several days of driving. If the code does not reset then you may have a defective gas cap or another leak in the fuel emission system.

99% of the time the code is caused by a gas cap that was not tightened properly.

here are more details for P0440
http://www.obd-codes.com/p0440

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I need to know what p0440 means


The technical meaning of the code is Evaporative Emission Control System Malfunction.

P0440 EVAP System No Flow can occur during the following conditions:
Fuel filler cap might be loose
  • Leak in the fuel tank, fuel filler neck or fuelsending unit 'O' ring.
  • PCM might have failed.
  • Purge vapor line might have clogged.
  • Purge or vent solenoid power circuit is open .
  • Fuel tank pressure sensor is damaged, disconnected or it failed.
  • Charcoal canister is filled with fuel or moisture.

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I have no gears forward or reverse. My Vehicle is a 2003 Dodge Ram 1500 4x4 Hemi with 170,000 on the clock. Fluid is clean and full with no leaks. I have the following trouble codes:...


Your scanner will give you the code but it will not tell you how to fix your vehicle. Scanners basically tell you what systems to check or what systems are failing.

These are what your codes mean:

P0700: Transmission Control Module
- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module. This is just a informative code.

P0734: Gear ratio error in 4th gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0732: Gear ratio error in 2nd gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0731: Gear ratio error in 1st gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0871: Transmission Fluid Pressure Sensor Switch C

P0876: Transmission Fluid Pressure Sensor Switch D

Emissions Codes:

P0400: Exhaust Gas Recirculation Flow Malfunction
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR temperature sensor and circuit
- EGR Valve

How to fix :
- Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

P0440: EVAP Emission Control System Malfunction
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0456: EVAP Control System Leak Detected (Very Small Leak)
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0441: EVAP Emission Control System Incorrect Purge
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

Based on the info check your EVAP system. I would check for leaks and maybe replace the EGR and the canister.

For the transmission check the TCM also you may need to take it to a mechanic though.

Hope this helps a little.

- Tech 101 (ASE CERTIFIED MASTER TECHNICIAN)
- Larson's Mobile Auto Repair
- 209-845-7620
- Oakdale, CA

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2001 subaru forester 225000 kms..how long do they typically last?


Provided the vehicle has been serviced regulary and had good quality oil and filters, theres no reason the car shouldn't get 400,000+ kms. Check its service history, and its oil consumption.

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1 Answer

Check engine light on - steady, not blinking. The manual says the gas cap may not have been put on tight (didn't seem to make the light go out) or that it's something with the emissions system?


I had the same problem , 99 subudu code po420 , the problem was air leaking into the fuel system , cause was from the gas filler tube to the gas tank. it was rotted so i replaced the filler tube( thats where you screw your gas cap onto and it goes down to the tank ) and cleared the code and haven't had a problem since.

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