Code P0302

[SLefler]

I have a 2008 Rubicon with 95,000 miles.

I was performing the 100,000 miles service which requires the cleaning of the Throttle body, replace the original Champion spark plugs, New spark plug wires and coil.

Sharing a surprising outcome:

I purchase (6) Autolight 5426 double platinum spark plugs (OEM recommended replacement). I had a rough idle and this Code P302 came up from the code display on the speedometer from the ignition key (3 times) process.

I replaced the P0302 code faulty Autolight spark plugs with new NGK Iridium spark plugs and the rough idle and the code disappeared.

 

[BLACKJKU]

These things are pretty picky on what gets installed on them. Sometimes the OEM replacement isn't always what they like.

I put the same Iridium Plugs in my 08 last year and never had a issue.

 

[Chris]

Yep, I agree. Also, for what it's worth, always check the gap, even if they say they come pre-gapped. I'm sure you did though