OBD-II Code · Emissions
P0431
Warm-Up Catalyst Efficiency (Bank 2)
medium severitySafe to drive$100-$2,000
Bank 2 pre-cat efficiency low.
Common symptoms
- CEL
Likely causes
- Aging cat bank 2
- Exhaust leak
Where to start
- Try the cheapest cause first. Start by checking: aging cat bank 2.
- Cost & scope. $100-$2,000
- 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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