P0440

[thstone]

Something is not right with your emissions control system. This typically won't affect the performance of the engine, but can increase emissions. Here is a list of things to check. Unfortunately, tracking down the exact source can be a bit challenging.

Common Problems That Trigger the P0440 Code

• Missing fuel cap
• Defective or damaged fuel cap
• Distorted or damaged Fuel Tank Filler Neck
• Torn or punctured Evaporative system hose(s)
• Defective Fuel Tank Sending Unit gasket or seal
• Split or damaged Carbon Canister
• Defective Evaporative Vent Valve and/or Evaporative Purge Valve
• Defective or damaged fuel tank

[ohhh my]

Originally Posted by thstone

Something is not right with your emissions control system. This typically won't affect the performance of the engine, but can increase emissions. Here is a list of things to check. Unfortunately, tracking down the exact source can be a bit challenging.

Common Problems That Trigger the P0440 Code

• Missing fuel cap
• Defective or damaged fuel cap
• Distorted or damaged Fuel Tank Filler Neck
• Torn or punctured Evaporative system hose(s)
• Defective Fuel Tank Sending Unit gasket or seal
• Split or damaged Carbon Canister
• Defective Evaporative Vent Valve and/or Evaporative Purge Valve
• Defective or damaged fuel tank

Any suggestions or instructions on how to check/troubleshoot all those items on your list? So far only #1 has been replaced with a new gas cap...

[The Radium King]

from what I've seen, the second last item on that list is a relatively common failure mode. perhaps search this forum for 'evep' 'evaporative' or 'purge' to see if you can get some diagnosis and solutions.