P2001

NOx Adsorber Efficiency Below Threshold Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–222 (est.)

Symptoms

Check Engine light comes on
Deterioration of vehicle dynamics
Increased fuel consumption
Unstable engine idling
Noticeable exhaust odor

Causes

NOx adsorber malfunction
Damage to NOx sensors
Problems with the adsorber regeneration system
Leaks in the exhaust system
Use of low-quality fuel

How to Fix

Check the integrity of the NOx adsorber
Test NOx sensors
Check the adsorber regeneration system
Inspect the exhaust system for leaks
Replace NOx adsorber if necessary

Related codes

P2000 P2002 P2004