Has any had a look yet? I would love some feed back. I will be recording video for them over the next week

⚠️ Rules: - No skipping steps - Explain WHY you chose your answers - Bonus if you call out the traps 👀 Comment your answers (e.g. B → B → C → B) Customer Concern: Intermittent loss of power under load. Feels like turbo drops out, returns after key cycle. Fault Code: - P0299 – Turbo Underboost What we know: - Normal at light throttle - Under load → power loss (limp mode) - Key cycle restores power - No smoke - No obvious boost leaks found visually Step 1: Where do you start? Pick ONE: A) Replace turbocharger B) Smoke test intake system C) Replace boost pressure sensor D) Clear codes and road test again Step 2: You perform a smoke test Result: No leaks found What next? A) Turbo must be faulty → replace B) Check live data for requested vs actual boost C) Replace wastegate actuator D) Replace intercooler Step 3: Live Data Results - Requested Boost: 220 kPa - Actual Boost: 140 kPa (under load) - Boost Control Duty: 90%+ What does this tell you? A) Sensor fault (incorrect reading) B) ECU not requesting boost C) System trying to make boost but can’t achieve it D) Fuel system issue Step 4: Final Direction What’s your next TEST? A) Replace turbo B) Command wastegate actuator and verify movement C) Replace MAP sensor D) Check spark plugs

This group is for mechanics, workshop owners, and serious DIYers who want to get better at diagnostics — together. No ego. No parts swapping. No guessing. We’re here to share real fault codes, real testing, and real-world thinking from the workshop and the garage. We’re kicking things off with a weekly Diagnostic Challenge — a place to break down scenarios, compare process, and sharpen our method. There’s no “perfect” answer. Only better thinking. Before the first challenge drops, comment below: - Tech / Owner / DIY - What you want to improve most in diagnostics Let’s build something solid