Question

1997Jeep Wrangler my OBD2 reads P0441, car runs fine. Also, the Check Engine light is on.

Answer 1

Hi there

This is an emissions code. Basically the code means there is bad purge flow. When the computer calls for the purge valve to open to pull the fuel vapors from the charcoal canister the pressure sensor makes sure it's happening. It's very common to have no running issues with this code and just the check engine light. There are several possible causes for this all must be checked and eliminated.

bad purge valve
- clogged or disconnected purge line
- vacuum leak near the purge line /engine intake connection
- bad vapor pressure sensor
- damaged or cracked charcoal canister
- faulty leak detection pump (LDP)
- bad NVLD unit (Chrysler)
- sticking or faulty vent valve
- misrouted vacuum hoses
- open or short in the purge valve control wiring 
- rusted filler neck (rust belt states)