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2018 Q50 Red Sport 400 - Turbo Issues and Misfires (P030x)

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Heather Y. · rep 0 · May 22, 5:09 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone, I'm reaching out because I'm having some serious trouble with my 2018 Infiniti Q50 Red Sport 400. Lately, I've noticed a significant loss of power, especially under acceleration, and the engine just doesn't feel right. The check engine light came on, and when I scanned it, I got multiple misfire codes (P0301, P0302, P0303).

I've heard about some common turbo issues with the VR30DDTT engine, and I'm worried this might be what I'm experiencing. The car also seems to be burning oil a bit more than usual, and there's a faint smell of something burning after longer drives. Has anyone else with a 2018 Q50 Red Sport faced similar problems? What was your experience, and what was the fix?

I'm trying to figure out if this is a known reliability issue or something more isolated. Any advice on diagnostics or what to tell the dealership would be greatly appreciated before I take it in.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:09 AM

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ClearTheCode admin answer:

It sounds like you're experiencing symptoms consistent with a failing turbocharger, which is unfortunately a known concern for some early VR30DDTT engines, particularly in the 2016-2018 Q50 and Q60 Red Sport models. The misfire codes (P030x) can often be a secondary symptom of a turbo issue, as a failing turbo can introduce excessive oil into the combustion chamber or cause incorrect air-fuel mixtures.

Here's what you should consider:

  1. Common Causes: The primary cause for these turbo failures often relates to issues with the turbocharger's bearing lubrication or manufacturing defects leading to premature wear. This can result in oil leaking into the exhaust or intake, causing smoke, oil consumption, and misfires.
  2. Diagnostic Steps:
    • Check for Boost Leaks: While less likely to cause misfires directly, a significant boost leak can affect engine performance and trigger codes like P0299 (underboost) or P0234 (overboost).
    • Inspect Spark Plugs: Remove and inspect your spark plugs. If they are fouled with oil, it strongly suggests oil is entering the combustion chamber, potentially from a failing turbo seal.
    • Listen for Turbo Whine: A distinct, loud whining or whistling sound from the engine bay, especially under acceleration, can indicate a failing turbo bearing.
    • Check for Smoke: Blue-ish smoke from the exhaust, particularly on startup or deceleration, is a classic sign of oil burning.
  3. When to See a Shop: You should take your 2018 Infiniti Q50 Red Sport 400 to a qualified Infiniti dealership or a reputable independent shop specializing in Infiniti/Nissan immediately. Continuing to drive with a failing turbo can lead to more severe engine damage, including catalytic converter failure due to oil contamination. The dealership will likely perform a comprehensive diagnostic, including checking turbo shaft play, boost pressure, and potentially performing a borescope inspection of the cylinders. Be prepared for the possibility of turbocharger replacement, which can be a significant repair.
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