OBD-II Code · Powertrain
P2173
High Airflow / Vacuum Leak Detected (Slow Accumulation)
medium severitySafe to drive$50-$600
PCM observed a large airflow imbalance — typical of a slow vacuum-leak accumulation.
Common symptoms
- CEL
- Rough idle
- Lean codes alongside
Likely causes
- Vacuum leak
- Failed MAF
- Intake gasket failure
Where to start
- Try the cheapest cause first. Start by checking: vacuum leak.
- Cost & scope. $50-$600
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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