2d • General discussion
🔧 Weekly Diagnostic Challenge #1
⚠️ 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
0
0 comments
🔧 Weekly Diagnostic Challenge #1
skool.com/fault-code-to-fix
Stop guessing. Start diagnosing. Real fault codes, real testing, real fixes for mechanics and serious DIYers. No parts swapping. Just method.
Leaderboard (30-day)
1
+4
Powered by