OBD Guide
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P11DB

NOx Sensor Current Performance Bank 1 Sensor 1

P11DB is an OBD-II diagnostic trouble code meaning: NOx Sensor Current Performance Bank 1 Sensor 1. Common causes: nox sensor malfunction, problems with wiring or connectors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Increased fuel consumption
  • Reduced engine power
  • Check Engine light comes on
  • Increased level of harmful emissions
  • Unstable engine operation

Causes

  • NOx sensor malfunction
  • Problems with wiring or connectors
  • SCR system malfunction
  • Low fuel quality
  • Problems with ECU software

How to Fix

  1. Check NOx sensor for damage
  2. Check the integrity of wiring and connectors
  3. Check the operation of the SCR system
  4. Replace NOx sensor if necessary
  5. Update ECU software

Related codes

P11DCP11DDP11DE

FAQ

What does the P11DB code mean?

P11DB is an OBD-II diagnostic trouble code that indicates: NOx Sensor Current Performance Bank 1 Sensor 1

What causes a P11DB error code?

The most common causes of P11DB include: NOx sensor malfunction; Problems with wiring or connectors; SCR system malfunction; Low fuel quality.

How do I fix a P11DB diagnostic trouble code?

To fix P11DB: Check NOx sensor for damage. Check the integrity of wiring and connectors. Check the operation of the SCR system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P11DB?

Yes, but get it checked soon

How much does it cost to fix P11DB?

The estimated repair cost for P11DB is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat