Crosstrek Turbo Failure Symptoms Need Expert Help

I had nearly identical symptoms on my 2015 Subaru Forester 2.0D. The engine light came on along with power issues and surging. A faulty boost sensor was initially suspected, but diagnostic testing revealed loose connections at the turbocharger control module. The turbo system relies heavily on precise readings from multiple sensors. When the intake manifold pressure signals get corrupted due to bad connections, the engine management system gets confused. This causes the erratic behavior you described. The fix involved cleaning the connector terminals and securing the wiring harness properly. While checking connections, they also found slight wear on the turbocharger wastegate actuator, which was beginning to stick. Having both issues addressed restored normal boost control and engine performance. This is generally not a serious repair if caught early. However, continuing to drive with these symptoms could potentially damage the turbocharger or engine over time due to improper boost control. Suggest having a qualified shop: Perform proper diagnostic testing of the entire turbo system, Check all sensor connections and wiring, Inspect the wastegate actuator operation, Verify boost pressure readings are within spec

Thanks for sharing your experience. My Crosstrek showed similar symptoms, check engine light, turbo boost issues and rough running. The mechanic found a boost leak from a cracked hose and also replaced the pressure sensor since readings were erratic. Quick question, do you remember roughly what the repair cost for the connections and wastegate work? Just wondering if the quote I got is reasonable. Also, has everything been running smoothly since the fix with no turbo-related issues coming back?

Since getting those issues fixed last month, my Forester has been running perfectly with no turbo-related problems returning. The previous boost pressure sensor issues are completely resolved after they fixed the faulty wiring connection for just 95€. The intake manifold pressure readings have been spot-on and the turbocharger is delivering proper boost again. My repair was much simpler compared to yours since I only needed the electrical connection sorted, no replacement parts like your cracked hose were required. The smooth running and proper boost control shows it was definitely worth addressing quickly before any damage could occur to the turbocharger itself. Regular boost leaks and sensor checks are now part of my maintenance routine to catch any issues early.

Following up to share the outcome, got my Crosstrek back from the shop yesterday. The cracked air intake hose was causing a major boost leak, and the turbo system was struggling to maintain pressure. They replaced the hose and the faulty boost sensor for 280€ total. The mechanic also cleaned all the turbo system connections while they were in there. The car feels completely different now, no more jerking or stalling, and the turbocharger is working smoothly again. Fuel economy is back to normal too. Really glad I caught this early before it could damage anything else. Going to have them check the pressure sensor and boost levels during regular services from now on. Thanks again for helping me understand what needed fixing.