What causes P1163 on a Honda?

Worn primary A/F sensor with lazy response past 100k miles Minor exhaust leak ahead of the sensor Oil or coolant fouling of the sensor element Use of a low-quality universal replacement sensor

How do I fix P1163 on a Honda?

Graph front A/F sensor response and fuel trims on an HDS scan tool Rule out exhaust leaks and engine oil or coolant consumption first Check for technical service bulletins on sensor reflash or updated parts Replace the sensor with a Honda-spec Denso or NGK unit if genuinely lazy Clear codes and confirm rapid sensor response on a drive cycle

P1163 Primary HO2S No 1 Circuit Slow Response

Q: What does P1163 mean on a Honda?

P1163. Primary HO2S No 1 Circuit Slow Response. Applies to Civic, Accord, CR-V, Odyssey, Pilot.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V, Odyssey, Pilot

What does P1163 mean on a Honda?

P1163. Primary HO2S No 1 Circuit Slow Response. This Honda-enhanced code applies to Civic, Accord, CR-V, Odyssey, Pilot.

Common causes of P1163

Worn primary A/F sensor with lazy response past 100k miles
Minor exhaust leak ahead of the sensor
Oil or coolant fouling of the sensor element
Use of a low-quality universal replacement sensor

How to fix P1163

Graph front A/F sensor response and fuel trims on an HDS scan tool
Rule out exhaust leaks and engine oil or coolant consumption first
Check for technical service bulletins on sensor reflash or updated parts
Replace the sensor with a Honda-spec Denso or NGK unit if genuinely lazy
Clear codes and confirm rapid sensor response on a drive cycle

Sources and review

Last updated 2026-09-24.