Jeep Patriot Knock Sensor Causing Rough Idle & High Fuel Use

Had a similar situation with my 2010 Jeep Compass. The knock sensor issue caused poor performance and rough idling. After troubleshooting, found the engine knock was triggered by a faulty connection between the knock sensor and its wiring harness. The ignition timing was getting wrong readings, causing the engine to run rich and waste fuel. While the knock sensor itself was intact, corrosion in the connector was disrupting the signal. The repair involved cleaning the connections and replacing the wiring harness section leading to the knock sensor. This was a serious issue that needed immediate attention since incorrect knock sensor readings can lead to engine damage if left unfixed. The repair resolved all symptoms, improved fuel economy, smooth idle, and the check engine light turned off. Worth noting that while diagnosing, its important to verify its actually the knock sensor and not other components that can cause similar symptoms, like spark plugs or oxygen sensors. A proper diagnostic scan tool should show specific knock sensor related trouble codes to confirm.

Thanks for sharing your experience. My issue turned out very similar, the rough idle and increased fuel consumption were definitely linked to the knock sensor. A full diagnosis revealed some additional ignition timing issues that needed attention. The auto repair shop found minor corrosion affecting the sensor wiring, which caused erratic engine performance. Would you mind sharing what the repair ended up costing you? Just wondering how it compares. Also curious if youve had any related problems since the fix? My fuel efficiency has stayed good after the repair, but always good to hear about long-term reliability.

Just got back from having this repaired on my Compass. Similar to your experience, the malfunction indicator came on due to the knock sensor causing ignition timing problems. The mechanic found and fixed the defective connection, just needed to replace a corroded wire and clean the sensor plug. Total repair cost was 95 Euro, which seems reasonable considering the improvement in performance. Since getting it fixed, the engine runs perfectly smooth with no signs of engine knock or poor performance. Its been several months now and fuel consumption is back to normal. The rough idle completely disappeared once they restored proper connection to the knock sensor. No related issues have cropped up since the repair. The quick diagnosis and relatively simple fix definitely saved money compared to replacing the entire sensor unit. These car problems can really impact performance when left unchecked, but addressing the wiring issue early prevented any major complications.

After dealing with the warning light and rough running issues, I finally got my Patriot fixed last week. The mechanic did a thorough check and found not just the knock sensor wiring problem, but also discovered the ignition timing was off due to the faulty signals. The repair involved cleaning the sensor connections and replacing a section of damaged wiring. Parts and labor came to 210 Euro, which was more than expected but worth it considering the poor performance I was experiencing. The check engine light is now off, and the engine runs smoothly again. Fuel economy has improved significantly, Im using about 15% less fuel than before. The rough idle is completely gone, and the engine feels much more responsive. No engine knock or hesitation since the fix. Really glad I got it sorted before any serious damage occurred. Looking back, the symptoms all point to the knock sensor being the culprit. If anyone else experiences similar issues, getting it diagnosed early can save a lot of headaches and potentially costly repairs down the road.