OBD-II Code · Emissions
P2000
NOx Trap Efficiency Below Threshold (Bank 1)
medium severitySafe to drive$500-$3,500
Diesel NOx adsorber efficiency low.
Common symptoms
- CEL
- Possible power reduction
Likely causes
- Failed NOx trap
- Failed NOx sensor
- DEF issue
Where to start
- Try the cheapest cause first. Start by checking: failed nox trap.
- Cost & scope. $500-$3,500
- 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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