OBD Guide
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P1172

Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

P1172 is an OBD-II diagnostic trouble code meaning: Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High. Common causes: a/f sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Check Engine light comes on
  • Increased fuel consumption
  • Reduced engine power
  • Unstable engine operation at idle

Causes

  • A/F sensor malfunction
  • Open or short circuit in the sensor circuit
  • Poor contact in the sensor connector
  • ECU malfunction
  • Air leak in the intake tract

How to Fix

  1. Check the integrity of the sensor wiring
  2. Check the contacts in the sensor connector
  3. Clean sensor contacts
  4. Replace A/F sensor if necessary

Related codes

P1170P1171P1173

Error P1172 by Vehicle Brand

FordJaguarLincolnMercuryVolkswagen

FAQ

What does the P1172 code mean?

P1172 is an OBD-II diagnostic trouble code that indicates: Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

What causes a P1172 error code?

The most common causes of P1172 include: A/F sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; ECU malfunction.

How do I fix a P1172 diagnostic trouble code?

To fix P1172: Check the integrity of the sensor wiring. Check the contacts in the sensor connector. Clean sensor contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1172?

Yes, but get it checked soon

How much does it cost to fix P1172?

The estimated repair cost for P1172 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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