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P2251 Honda Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage

- Code Popularity: 29,024 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P2251 Honda?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted
  • Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection
  • Faulty Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1
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How to Fix the DTC P2251 Honda?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2251 Honda code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P2251 Honda Description

The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The rear A/F sensor transmits a signal to the Powertrain Control Module (PCM), and it enables overall feedback control. The PCM controls fuel injection duration by comparing the target air/fuel ratio with the rear A/F sensor signal. When the VSB1 terminal voltage is more than a specified value for a predetermined time, the PCM detects a malfunction and stores a DTC.

OBDII Code P2251 Honda - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage - AutoCodes.com
P2251 Honda Code - Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage

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Code P2251 Honda comments

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