“Guinevere” 03 LC.

[Fj60+]

I was getting an intermittent code p0420- gas cap was my first try - then I ended up replacing one of the downstream o2 sensor- still have the code, I’m thinking charcoal canister or the other downstream o2 sensor. I’ll clear the code via the scan gauge and will go weeks if not months without seeing it.

 

[offoradjunkie]

I was getting an intermittent code p0420- gas cap was my first try - then I ended up replacing one of the downstream o2 sensor- still have the code, I’m thinking charcoal canister or the other downstream o2 sensor. I’ll clear the code via the scan gauge and will go weeks if not months without seeing it.

I had the same issue on mine, and replacing the gas cap cleared it.