What causes P1158 on a Honda?

Aging air/fuel ratio sensor 1 with a failing low-side terminal Corroded or loose A/F sensor 1 connector raising terminal resistance Exhaust leak ahead of the sensor diluting the exhaust sample Open or shorted low-voltage signal wire to the ECM Failing ECM sensor reference circuit

How do I fix P1158 on a Honda?

Confirm freeze frame data and A/F sensor voltage with a Honda HDS scan tool Smoke test the exhaust manifold and downpipe for leaks first Backprobe the sensor terminals and compare voltages against service manual spec Inspect the connector pins for corrosion, spread terminals, and water intrusion Replace air/fuel ratio sensor 1 with an NTK/OE equivalent after excluding leaks and wiring faults

P1158 Air/Fuel Ratio Sensor 1 Terminal Low Voltage

Q: What does P1158 mean on a Honda?

P1158. Air/Fuel Ratio Sensor 1 Terminal Low Voltage. Applies to Civic, Accord, CR-V with wideband A/F sensors.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V with wideband A/F sensors

What does P1158 mean on a Honda?

P1158. Air/Fuel Ratio Sensor 1 Terminal Low Voltage. This Honda-enhanced code applies to Civic, Accord, CR-V with wideband A/F sensors.

Common causes of P1158

Aging air/fuel ratio sensor 1 with a failing low-side terminal
Corroded or loose A/F sensor 1 connector raising terminal resistance
Exhaust leak ahead of the sensor diluting the exhaust sample
Open or shorted low-voltage signal wire to the ECM
Failing ECM sensor reference circuit

How to fix P1158

Confirm freeze frame data and A/F sensor voltage with a Honda HDS scan tool
Smoke test the exhaust manifold and downpipe for leaks first
Backprobe the sensor terminals and compare voltages against service manual spec
Inspect the connector pins for corrosion, spread terminals, and water intrusion
Replace air/fuel ratio sensor 1 with an NTK/OE equivalent after excluding leaks and wiring faults

Sources and review

Last updated 2026-09-07.