DTC P0131:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITIONS & POSSIBLE CAUSES

DTC P0131:00	A/F sensor circuit low input
DETECTION CONDITION	The PCM monitors the input voltage from the A/F sensor while the engine is running. If the input voltage is below 1.2 V for 1 s , the PCM determines that the A/F sensor circuit voltage is low. Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor connector or terminal malfunction PCM connector or terminal malfunction Short to ground in wiring harness between A/F sensor terminal B and PCM terminal 2AD Short to ground in wiring harness between A/F sensor terminal D and PCM terminal 2AC Short to ground in wiring harness between A/F sensor terminal F and PCM terminal 2Z A/F sensor malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0131:00

A/F sensor circuit low input

DETECTION CONDITION

The PCM monitors the input voltage from the A/F sensor while the engine is running. If the input voltage is below 1.2 V for 1 s , the PCM determines that the A/F sensor circuit voltage is low.

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

A/F sensor connector or terminal malfunction
PCM connector or terminal malfunction
Short to ground in wiring harness between A/F sensor terminal B and PCM terminal 2AD
Short to ground in wiring harness between A/F sensor terminal D and PCM terminal 2AC
Short to ground in wiring harness between A/F sensor terminal F and PCM terminal 2Z
A/F sensor malfunction
PCM malfunction

Courtesy of MAZDA MOTORS CORP.