My 2000 SOHC Highline has a perpetual check engine code 0456. It's been well over a year. I'll clear it and within a few hundred miles it's back.

I know this code, (minor emissions leak or something) is usually due to the gascap not being clicked tight. I always make sure mine is closed properly, so I recently bought a new Mopar gascap and the problem is still there.

What else could this code be from?

I mentioned in a previous thread my car feels like it needs a tuneup. It has 126k miles, and the only engine mod is a K&N filter.

Any thoughts?

TIA.

 

Could also be a small leak in one of the lines in the evap/purge system. There should be a diagram on your hood of how it runs. From the gas tank, to the canister, the solenoid, and then to the intake manifold (or TB). Most of the hoses are rubber, so they can rot or get small cracks. Could also be a small crack in the canister itself.

Best of luck!