DTC Advanced Diagnostics: P2270: General Description

Courtesy of HONDA, U.S.A., INC.

High output performance monitor 

Courtesy of HONDA, U.S.A., INC.

Low output performance monitor 

Courtesy of HONDA, U.S.A., INC.

The rear secondary heated oxygen sensor (secondary HO2S (bank 1, sensor 2)) detects the oxygen content in the exhaust gas downstream of the rear warm up three way catalytic converter (WU-TWC) (bank 1) during stoichiometric air/fuel ratio feedback control. The powertrain control module (PCM) controls the air/fuel ratio from the rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) output voltage so that the rear WU-TWC (bank 1) efficiency is optimized. When power is applied to the rear secondary HO2S (bank 1, sensor 2) heater, if the rear secondary HO2S (bank 1, sensor 2) output continues to be low (lean) during feedback control, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

*: High output performance monitor

**: Low output performance monitor