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P1167 is a manufacturer-specific diagnostic troubleshooting code. Therefore, there will be a different meaning or fault associated with the code for every manufacturer.

A Honda’s ECM monitors how much current is being drawn by the heater circuit when the heater relay is turned on. A P1167 or P1166 is set if the drawn amps are not within spec.

The code P1167 indicates that your vehicle has an air/fuel sensor problem. This one is the closest sensor to the engine; the oxygen sensor is further down in the exhaust. Based on multiple inputs, the ECM determines the output by polling the inputs.

It flags a check engine light when, for instance, the engine temperature is in a certain range, but the O2 sensor doesn’t match the computer’s expectation. All of these ranges of values have been preprogrammed in memory.

Air/fuel mixtures and oxygen sensors that monitor how well a vehicle is driven are responsible for nearly all P1167 codes across all manufacturers.

P1167 Honda Accord Definition: Air/Fuel Ratio Sensor 1 Heater System Malfunction

In the exhaust system, the Air/Fuel Ratio (A/F) sensor 1 measures the oxygen content of exhaust gases. Engine Control Modules (ECMs) receive voltage from the A/F sensor.

A heater for the sensor element is embedded in the A/F sensor (sensor 1). By controlling the current flowing through the heater, it stabilizes and speeds up the detection of oxygen content.

There is a limit to the amount of oxygen that can be led through the diffusion layer as the applied voltage to the element electrode increases. The air/fuel ratio is detected by measuring the current amperage, which is proportional to the oxygen content in the exhaust gasses.

The ECM compares a set target air/fuel ratio to control fuel injection timing with the detected air/fuel ratio. A lean air/fuel ratio is indicated by a low voltage on the A/F sensor (sensor 1).

To issue a Rich command, the ECM uses A/F feedback control. For example, an ECM uses A/F feedback control to issue a Lean command if the A/F sensor (sensor 1) voltage is high.

Code P1167: What Are The Common Causes?

• There is a problem with the circuit of the Air/Fuel Ratio Sensor 1
• One of the heated air/fuel ratio sensors is failing

How Do You Troubleshoot Honda Code P1167?

Diagnostic troubleshooting code (DTC) P1167 indicates a problem with the heated air/fuel ratio sensor. There are a couple of things that might be malfunctioning. 

In this case, either the sensor is malfunctioning, the heating element is malfunctioning, or the electrical circuit for the sensor is malfunctioning. 

By visually inspecting the sensor and its wiring, you can determine if there is any obvious damage.

How To Fix P1167 Honda Accord DTC Code?

This circuit is pretty easy to diagnose. Can the heater circuit be powered and grounded through the connector? If so, then you should throw away the aftermarket sensor and replace it with a Honda one. It’s something I’ve seen before.

A new air/fuel ratio sensor 1 can be easily installed at home if the right socket is available. However, ratchets capable of compensating for the sensor’s cord are required with most air/fuel ratio sensors.

Where Is The P1167 Honda Accord Sensor Located?

In most modern vehicles, two sensors measure the air/fuel ratio (or oxygen). Their functions are similar, but they perform different ones for the engine. Under the vehicle, between the engine and the catalytic converter, air/fuel ratio sensor 1 can be found on the exhaust. 

This sensor has a built-in heating system that cannot be serviced separately. In addition, there may be an air/fuel ratio sensor 1 on transaxle models that is convenient to access because it is located toward the top of the engine compartment.

Are Code P1167 and or P1166 Related?

In fact, yes. Sometimes you will get both of these codes at once, the P1167 and P1166. When the engine is started, the O2 sensor is heated by an electric current to enable it to read more accurately. However, the two codes indicate a problem with the heater circuit; there may not be voltage to the heater, or the heater may be defective.

Within 80 seconds of starting the engine, there should be 12V on the harness side via the red and blue wires at the sensor plug. As a rule of thumb, the resistance across the heater terminals should be between 10 to 40 ohms.

In the engine compartment fuse box on the driver’s side, check the 15-amp fuse for the ECM/Cruise Control. Also, check the 20-amp fuse for the LAF heater in the passenger’s side fuse box.

How Serious Is The Honda P1167 Code?

These codes indicate that there is a problem with the heater circuit for the AF ratio sensor. There is a possibility that a blown fuse causes the problem, so make sure you check them all thoroughly.

The car could be driven until you have improved your financial situation as long as you do not require an emission inspection. The warning light would, however, be in your face. Due to the lack of a closed loop, your fuel economy might decrease, but it won’t cause any long-term damage.

Final Words

To resolve the P1167 Honda Accord code, most often, the air/fuel ratio sensor 1 must be replaced. However, wiring issues shouldn’t occur on that side of the circuit’s connector with new sensors since they come with the correct connectors.