P0153O2 Sensor Circuit Slow Response Bank 2 Sensor 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The oxygen sensor before the catalytic converter on bank 2 (sensor 1) is the main control sensor for the mixture. It is either a switching sensor (about 0.1 V lean to 0.9 V rich) or a wide-band sensor that works with a pump current evaluated by an interface chip. Bank 2 exists only on engines with two exhaust manifolds. P0153 is the bank 2 counterpart of P0133: the sensor reacts too slowly to mixture changes. GM measures passively the average response time in both directions across 300/400–600 mV over 60 s and also fails too few transitions; Ford modulates the mixture itself and evaluates amplitude, signal line length or response times. The test runs once per drive at warm part load, two trips. The previous obdex title of this code wrongly repeated P0152's 'High Voltage'.
- What you may notice
- Check engine light on (after two drive cycles)
- Slightly higher consumption
- Higher emissions, possible emissions test failure
- P0430 may follow
- Likely causes
- LikelyAged, sooted or poisoned upstream sensor (oil, silicone, coolant, additives)
- PossibleExhaust leak ahead of the sensor (manifold gasket, crack)
- PossibleSensor heater weak or intermittent (sensor too cold)
- PossibleMixture fault: air leak, injectors, fuel pressure, air flow sensor
- RareWiring resistance or aftermarket sensor with different characteristics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.