P0165
Generic (SAE) Basic entry
O2 Sensor Circuit Slow OBDResponse
Severity
Medium
Typical repair cost
60 – 500 EUR
System
Powertrain
What it means
P0165 is defined as "O2 Sensor Circuit Slow OBDResponse". the engine control module stores it when the monitored condition for this component or system is outside the limits programmed by the manufacturer.
Advertisement728 × 90
Symptoms
- Check engine light on
- Rough or unstable idle
- Hesitation or poor acceleration
- Increased fuel consumption
- Possible limp mode with reduced power
Common causes
- O2 Sensor Circuit Slow OBDResponse worn, contaminated or out of calibration
- Mechanical problem in the system the sensor measures
- Air, vacuum or exhaust leak influencing the reading
- Wrong or low-quality replacement part
- Wiring resistance causing a small voltage offset
How to diagnose
- Compare the live O2 Sensor Circuit Slow OBDResponse reading with a known-good value or a second sensor at idle and at 2500 rpm
- Check for air, vacuum or exhaust leaks that could skew the reading
- Inspect the component for contamination and clean it if the design allows
- Verify the part number is correct for the engine
- Replace the O2 Sensor Circuit Slow OBDResponse if the reading remains out of specification
Frequently asked questions
Can I keep driving with P0165?
Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.
Will clearing P0165 fix it?
No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.