Subaru Legacy Multiple Warning Lights, Sensor Alert

Last month I dealt with similar warning lights on my 2011 Subaru Outback diesel. The temp sensor readings were inconsistent, triggering multiple dash warnings including oil pressure alerts. After testing, it turned out the engine sensor wiring harness had deteriorated where it connects to the engine control module. The connection was loose and corroded, causing intermittent signal issues. This is actually a known problem on these engines. The repair involved replacing the engine temperature sensor harness and cleaning the connector pins. While not a major mechanical issue, leaving it unfixed can cause the engine management system to receive incorrect data, potentially leading to performance problems. For accurate diagnosis, the mechanic should check: Engine sensor connector pins for corrosion, Wiring harness condition around high-heat areas, Ground connection quality, Engine control module connections The fault codes you mentioned often point to electrical issues rather than mechanical problems with these models. Getting this fixed soon is important since incorrect temperature readings can affect engine performance and fuel economy. Based on your mileage, its likely the same wiring harness issue rather than a sensor failure. Ask the mechanic to specifically inspect the harness and connections before replacing any sensors.

That temperature sensor wiring issue sounds exactly like what I dealt with on my Legacy last winter. The symptoms match perfectly, especially the multiple warning lights and oil pressure alerts. Do you remember roughly how much the repair cost you? Im curious if prices have changed since then. Also, has everything been working properly since the fix, or have you noticed any other electrical gremlins pop up? Makes sense to check the wiring harness first before jumping straight to replacing the temp sensor or oil sensor components. These electrical issues can be tricky to diagnose without proper testing.

Since getting the repair done last month, everything has been running perfectly, no more warning lights or oil pressure alerts. The mechanic found a damaged cable connection at the oil temperature sensor, which was causing the automotive sensor readings to fluctuate. The total repair cost was 95€, which covered fixing the faulty engine oil temperature sensor wiring. Much cheaper than replacing the entire sensor unit, which some shops might have suggested. The mechanic mentioned these connector issues are quite common on our engine type. The temp sensor is now giving consistent readings, and the engine temperature gauge shows normal values. No electrical problems have surfaced since the repair. Its really important to get an accurate diagnosis rather than just throwing parts at the problem, saved me money in the end. If your symptoms match what I experienced, its worth having a technician check the sensor connections first. The warning lights should clear up once the wiring is properly secured and any corrosion is cleaned from the connection points.

Thanks for the input. Just wanted to share how my repair experience turned out. Took the car to a different mechanic who actually listened to the symptoms and checked the wiring first instead of trying to replace parts unnecessarily. Sure enough, they found corroded connections at the engine temperature sensor wiring harness. The automotive sensor itself was fine, it was just getting poor contact through the damaged wires. Total repair came to 120€ for cleaning the connections, fixing the harness, and testing the temp sensor system. Been driving for two weeks now with no warning lights or issues. The engine temperature readings are steady and all other gauges are working normally. Really glad I got a second opinion instead of paying for unnecessary sensor replacements. Good lesson learned about finding a mechanic who properly diagnoses electrical issues rather than just swapping parts. The car runs better than ever now that the temperature sensor is getting clean signals to the computer.