P1167 – Air/Fuel Ratio Sensor 1 Heater System Malfunction (ACURA, HONDA)

By Jessica Howe (Contact Me)
Last Updated 2019-09-30
ASE Mechanic

Trouble CodeFault LocationProbable Cause
P1167 Air/Fuel Ratio Sensor 1 Heater System Malfunction (ACURA, HONDA)
Mass Air Flow Sensor 2 Unplausible Signal (AUDI, VOLKSWAGEN)
Capacitor Voltage 1 (CHRYSLER, DODGE, JEEP)
O2 Sensor System Lambda Controller at the Limit Bank 2 (HYUNDAI, KIA)
Heated Rear Oxygen Sensor 2 Maximum Voltage Monitoring Bank 2 (INFINITI, NISSAN)
Fuel System Rich During Deceleration Fuel Cut-Off Bank 1 (ISUZU)
HO2S11 Rich In Decel Fuel Cutoff (SUZUKI)

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What Does Code P1167 Mean?

The P1167 diagnostic troubleshooting code is manufacture specific. Every manufacture will have a different meaning or fault associated with the code. That being said, nearly all P1167 codes across all manufactures have something to do with the air/fuel mixture and the oxygen sensors that monitor how well the vehicle is being driven. European models may differ from this, and you will need to look up the DTC for that specific manufacture for a more accurate description of what the code may mean for your model.

For Honda and Accura, a P1167 code stands for a heater system malfunction in the air/fuel ratio sensor 1. The air/fuel ratio sensor monitors the amount of oxygen in the exhaust fumes exiting the engine. This allows the vehicle’s powertrain control module to adjust the fuel/air ratios to achieve maximum efficiency. These sensors are heated when needed in order to start making correct readings as soon as possible. A P1167 code indicates that the heating system is not working.

Where is the P1167 sensor located?

There are two air/fuel ratio sensors (or oxygen sensors) on most modern vehicles.  They are relatively the same, but perform different functions for the engine. The air/fuel ratio sensor 1 is located on the exhaust under the vehicle between the engine and the catalytic converter. The heater system for the sensor is built into it, and is not serviceable on its own. Transaxle models may have the air/fuel ratio sensor 1 located towards the top of the engine compartment, making it easier to access.

What are the common causes of code P1167?

  • Failing Heated Air/Fuel Ratio Sensor 1
  • Air/Fuel Ratio Sensor 1 Circuit Malfunction

How expensive is it to fix code P1167?

Under $100

What are the symptoms of code P1167?

  • Check engine light
  • Reduced gas mileage
  • Lack of acceleration

What are common solutions to code P1167?

The most common repair to resolve this code is to replace the air/fuel ratio sensor 1. New sensors come with the appropriate wiring connectors, which should also eliminate any wiring issues on that side of the circuit’s connector.

How serious is code P1167?

The vehicle may perform differently with a P1167, but it is not likely to cause a serious issue while driving or prevent you from operating the vehicle.

How difficult is it to repair code P1167?

If the air/fuel ratio sensor 1 simply needs to be replaced, it is easy to do at home with the right socket. Most air/fuel ratio sensors require a special attachment for a ratchet that will compensate for the sensor’s cord.

How do you troubleshoot code P1167?

A P1167 DTC (diagnostic troubleshooting code) indicates that there is an issue with the heated air/fuel ratio sensor. This is either due to an issue with the sensor itself, the heating element in the sensor, or the sensor’s electrical circuit. A visual inspection can tell you if there is obvious damage to the sensor or its electrical wiring.


Codes Related to P1167

  • P1162: Air/Fuel Ratio Sensor 1 Circuit Malfunction
  • P1166: Heater System Electrical Problem
  • P1135: Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1 (Toyota)

Other Manufacturer Specific Definitions for P1167

Mass Air Flow Sensor 2 Unplausible Signal (Volkswagen)
Air fuel (A/F) sensor - RSX 1 - heater system malfunction (Acura)
Mass air flow (MAF) sensor, Bank 2 - range/performance problem (Audi)
Capacitor Voltage 1 (Chrysler)
Capacitor Voltage 1 (Dodge)
Heated oxygen sensor (H02S)- front- heater circuit malfunction (Honda)
Heated oxygen sensor (H02S) 1, bank 2- control limit reached (Hyundai)
Heated oxygen sensor (H02S) 2, bank 2 – voltage high (Infiniti)
Fuel trim, bank 1 – mixture too rich during deceleration (Isuzu)
Capacitor Voltage 1 (Jeep)
Heated oxygen sensor (H02S) – front, bank 2 – control limit (Kia)
Heated oxygen sensor (H02S) 2, bank 2 – maximum voltage monitoring (Nissan)
HO2S11 Rich In Decel Fuel Cutoff (Suzuki)
Electronic throttle system (ETS) – signal malfunction (Volvo)

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