Powertrain
generic / SAE
P0134
O2 Sensor Circuit No Activity / Slow Response (Bank 1 Sensor 1)
The ECU detects that the upstream oxygen sensor on bank 1 shows no switching activity or responds too slowly to changing exhaust gas composition. Often the sensor is aged, contaminated by silicone or fuel additives, or the heater circuit is degraded.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 34
Possible causes
- Sensor aged or poisoned (silicone, lead, coolant) high
- Sensor heater circuit weak medium
- Exhaust leak upstream of sensor diluting reading medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
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References
sae:J2012