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2004 PT Cruiser Check Engine Light with Code P0303: Misfire in Cylinder 3 - Running Fine at 112,000 Miles

Model: 04 PT Cruiser Fault Code: P0303 Posted: 2016-01-21 08:38

The check engine light turned on in my 2004 PT Cruiser, and after scanning at a local auto parts store, I received diagnostic code P0303 — indicating a misfire in cylinder 3. Despite this, the car is running smoothly with no noticeable performance issues. It has accumulated 112,000 miles, and I don't feel any drivability problems. I'm wondering if there's an underlying issue that could be causing this code even when the vehicle performs normally. What should I check or troubleshoot next? Is it possible for a misfire to occur without affecting performance? Any advice on how to diagnose or resolve P0303 in a 2004 PT Cruiser would be greatly appreciated.

Related fault codes

P0303

Comments (3)

Anonymous 2016-01-21 08:52

OBD-II systems are more reliable than relying on subjective driving sensations. Try clearing the code and monitor if it returns under normal conditions. Consider adding a fuel system cleaner like Techron or Seafoam to help clean injectors and combustion chambers. Let us know your results after retesting.

Anonymous 2016-01-21 10:08

I'm not actually a mechanic — my father-in-law thinks I am, but that's just because I know how to swap parts! A misfire code alone doesn't point to the exact cause. I'll start with adding Techron as a simple first step. How do I reset the code? And what specific components should I inspect if the issue returns?

Anonymous 2016-01-21 11:05

The auto parts store that performed the scan can typically clear the code — they may even recommend a fuel system treatment like Techron or Seafoam. If the P0303 returns, let us know and share details such as whether you cleared the code and added the recommended product for retesting. For safety and liability, it's best to ask if they will reset the code manually — some stores may refuse without a specific request.