Engine code P1391 & P0303 - Jeep Wrangler Forum

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Old 03-17-2013, 06:51 PM
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Engine code P1391 & P0303

I have had the same engine code on my 97 2.5 wrangler since I got it nearly a year ago. I put a new crank shaft position sensor on it two days ago and the check engine light went away. But then came back 24 hours later. I erased the code, then came back after around 10 miles of driving. But this time the P0303 came back with it. Which is a misfire on cylinder 3. But jeep drives fine. Any ideas? Thanks
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Old 10-11-2014, 06:28 PM   #2
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Check the connection between the new sensor and the wiring harness. Those pins wear and get loose over time. You can get a new pigtail with connector or the wires can be cut and soldered together.
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