karenweiss33
RNessa Turbo Actuator Fault
Summary of the thread
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)
karenweiss33 (community.author)
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?
dennisstern6
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.
karenweiss33 (community.author)
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
dennisstern6
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?