DTC P0134 [LF]: Notes

DTC P0134 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0134	A/F sensor no activity detected
DETECTION CONDITION	The PCM monitors the A/F sensor element impedance when the following conditions are met. If the A/F sensor element impedance is 80 ohms or more , the PCM determines that A/F sensor is not activated. MONITORING CONDITION PCM Adaptive Memory Production, EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S, and TWC Repair Verification Drive Mode Following conditions are met: Time from engine start: above 30 s (ECT when engine start is 20°C {68°F}) Diagnostic support note This is an intermittent 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 (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	A/F sensor looseness A/F sensor connector or terminals malfunction A/F sensor heater malfunction PCM connector or terminals malfunction Short to power supply in wiring harness between A/F sensor terminal A and PCM terminal 2AD Open circuit in wiring harness between A/F sensor terminal A and PCM terminal 2AD A/F sensor deterioration PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0134

A/F sensor no activity detected

DETECTION CONDITION

The PCM monitors the A/F sensor element impedance when the following conditions are met. If the A/F sensor element impedance is 80 ohms or more , the PCM determines that A/F sensor is not activated.
MONITORING CONDITION
- PCM Adaptive Memory Production, EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
  - Time from engine start: above 30 s (ECT when engine start is 20°C {68°F})

Diagnostic support note

This is an intermittent 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 (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

A/F sensor looseness
A/F sensor connector or terminals malfunction
A/F sensor heater malfunction
PCM connector or terminals malfunction
Short to power supply in wiring harness between A/F sensor terminal A and PCM terminal 2AD
Open circuit in wiring harness between A/F sensor terminal A and PCM terminal 2AD
A/F sensor deterioration
PCM malfunction

Courtesy of MAZDA MOTORS CORP.