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DTC codes / Honda codes / P1167

P1167 · HondaHO2S11 Heater Circuit VS+ Fault Bank 1 Sensor 1

P1167 on Honda vehicles indicates that the powertrain control module (PCM) has detected an abnormal voltage condition in the heater circuit of the primary heated oxygen sensor (HO2S11), which is Bank 1 Sensor 1. The PCM monitors the heater circuit for expected voltage changes when the heater is commanded on, and this code sets when the circuit voltage does not match the commanded state, typically indicating an open, short, or excessive resistance in the heater element or its wiring.

SystemPowertrain
Code typeHonda specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light (MIL) on the dashboard.
  • Often no symptoms besides the warning light, especially in mild weather.
  • Slightly rough idle or hesitation during cold starts due to delayed oxygen sensor response.
  • Decreased fuel economy as the PCM may default to open-loop fuel control longer than normal.
  • In rare cases, a failed emissions test due to the oxygen sensor heater not functioning.
  • Possible intermittent misfire or poor driveability if the sensor heater fault affects closed-loop fueling.

Common causes, most likely first

  1. Failed heater element inside the Bank 1 Sensor 1 oxygen sensor.
  2. Open or shorted wiring in the heater circuit between the sensor and the PCM.
  3. Corroded or loose electrical connector at the oxygen sensor or PCM.
  4. Blown fuse or relay supplying power to the oxygen sensor heater circuit.
  5. PCM internal fault affecting the heater control driver (less common).
  6. Excessive resistance in the ground circuit for the oxygen sensor heater.

How to diagnose and fix it

  1. Inspect the oxygen sensor connector and wiring for damage, corrosion, or loose pins; clean or repair as needed.
  2. Check the fuse and relay for the oxygen sensor heater circuit and replace if faulty.
  3. Measure the resistance of the heater element at the sensor connector and compare to Honda specifications; replace the sensor if out of range.
  4. Test for voltage and ground at the sensor connector with the key on and engine off to verify power and ground integrity.
  5. Check continuity and resistance of the heater circuit wiring between the sensor and PCM; repair any open or short.
  6. If all external circuits test good, suspect the PCM; perform pinpoint tests before replacement.
  7. Clear the code and verify the repair by running the oxygen sensor heater monitor to confirm the code does not return.

Before replacing the oxygen sensor

  • A common mistake is replacing the oxygen sensor without checking the heater circuit fuse and relay, which can be the real cause of P1167.
  • The heater element can fail intermittently when hot, so resistance tests should be performed both cold and after warming the sensor with a heat gun.
  • Corrosion at the sensor connector is a frequent culprit on older Hondas, especially in regions with road salt, and can mimic a failed sensor.
  • P1167 specifically refers to the heater circuit voltage, not the sensor signal, so a slow or lazy sensor without a heater fault will not set this code.
  • On some Honda models, a weak battery or charging system issue can cause low voltage to the heater circuit and trigger P1167 without any sensor fault.

Can I keep driving with P1167?

You can generally continue driving with P1167, but avoid extended idling and heavy loads until repaired, as the fault may increase emissions and reduce fuel economy. If the check engine light flashes or you notice rough running, have the vehicle inspected promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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