P1167Manufacturer-specific code

P1167 Code: Air Fuel Ratio Sensor Heater System (Honda, Sensor 1)

On Honda and Acura, the P1167 code points to the air fuel ratio sensor heater system (sensor 1). Fuel use runs higher after a cold start. The heater is not reaching the expected temperature in the expected time.

Severity
Medium
Can I keep driving?
Yes, no immediate risk
Estimated cost
$80 to $350
Difficulty
Easy
System
Air and Fuel
Applies to
Depends on the manufacturer

Common in: Honda

Updated Reviewed by Renzo Chacca

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What the P1167 code means

P1167 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Honda and Acura. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1167
Honda and AcuraAir fuel ratio sensor heater system (sensor 1)

Many Hondas with an air fuel ratio sensor (A/F sensor) use it ahead of the catalytic converter in place of the classic oxygen sensor. It measures the mixture across the whole range, and the computer shows it as a current or as a lambda ratio. To work, it has to be very hot, which is why it has an internal heater.

The computer sets the P1167 code when the heater does not reach the expected temperature in the expected time.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1167 code symptoms

  • Check engine light on.
  • Higher fuel use after a cold start.

Likely causes of the P1167 code

  1. Aged A/F sensor. Confirm it by comparing its reading with the actual value.
  2. Low supply voltage. Confirm it with the tests in the diagnosis section.
  3. Connector with resistance. Check the locking tab and the pins, and look for moisture or corrosion.

How to diagnose the P1167 code step by step

  1. Measure the heater resistance.
  2. Check the voltage with the engine running.

How to fix the P1167 code

  • Replace the A/F sensor.
  • Repair the power supply, then clear the P1167 code and confirm it stays gone.

Technical reference data

  • A/F sensor heater resistance: about 1.8 to 3.4 ohms at 20 °C (68 °F).
  • Sensor voltage on the scan tool: close to 3.3 V at the ideal mixture on many models (higher means lean, lower means rich).
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Very common on the Civic, Accord, CR-V, Fit and Odyssey.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1167

What does the P1167 code mean on a Honda?
It points to the air fuel ratio sensor heater system (sensor 1). Fuel use runs higher after a cold start because the heater is slow to bring the sensor up to temperature.
Does P1167 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1167 code?
Yes. The engine keeps running and the main effect is higher fuel use on cold starts. Still, plan the repair so mixture control does not suffer.
How much does it cost to fix P1167?
On a Honda the cost runs from about $80 to $350. Most of that is the new A/F sensor, while a power supply or connector repair costs less.
Will a P1167 code clear itself?
Unlikely. An aged heater or a connector with resistance does not heal on its own, so the code returns until the cause is repaired.
What is the most common cause of P1167?
An aged A/F sensor whose heater no longer warms it fast enough. Low supply voltage and a high-resistance connector are the other suspects.

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Questions about the P1167 code

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