karenweiss33

RNessa Turbo Actuator Fault

My 2001 Nissan RNessa with a gasoline engine has a boost pressure actuator fault at only 39993 km. The check engine light is on, engine power is diminished, and throttle response is sluggish. There's a whistling noise from the engine bay, hissing during acceleration, occasional stalling, and increased fuel consumption. I suspect a defective electrical bypass valve. Anyone else experienced similar issues with their turbo wastegate, boost pressure, or turbo actuator?

A 2001 Nissan RNessa with a gasoline engine is experiencing a boost pressure actuator fault, indicated by a check engine light, diminished engine power, sluggish throttle response, and increased fuel consumption. Possible causes include a defective electrical bypass valve, restricted actuator arm movement, and oil seepage near the turbocharger. The suggested solution is to have a workshop inspect and replace the defective valve, which resolved the issue and restored the car's performance.

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4 comment(s)

I had very similar symptoms with my RNessa. It sounds like you're experiencing a classic turbo actuator fault. Have you checked the actuator arm for free movement? Any signs of oil leaks around the turbo?

The actuator arm appears to move with some resistance, and I did notice slight oil seepage near the turbocharger housing. Could that restricted movement and minor leakage indicate a more serious underlying issue?

The resistance, seepage and symptoms you describe all point towards the actuator valve being defective. Bypass valves are quite fragile and that model year did have some problems. Given the symptoms, it's advisable to have a workshop perform a thorough inspection and replace the defective valve. Continuing to drive it could exacerbate the issue.

I brought my RNessa to a trusted mechanic. As you suspected, the electrical bypass valve was indeed defective. The repair, including parts and labour, cost 250€. The car runs smoothly now.

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NISSAN

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RNESSA