P0152O2 Sensor Circuit High Voltage 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. P0152 is the bank 2 counterpart of P0132. Switching sensors: GM above 1050 mV (100 of 125 samples, after warm-up), Ford above 1.1 V for 10 s – a reading the sensor cannot produce itself, so heater or battery voltage on the signal wire is the usual cause; GM also reads an open wire as high. Wide-band sensors: a sensor wire shorted to voltage. P0152 together with P0158 points to a shared short in the bank 2 harness. Two trips. A stored code usually switches mixture control to open loop and suspends adaptation and converter monitoring.
- What you may notice
- Check engine light on
- Higher consumption, possibly rough running (no mixture control)
- Higher CO/HC values
- Often with P0158 or P0155
- Likely causes
- LikelySignal wire shorted to the heater supply or battery voltage (melted or chafed harness)
- LikelySensor faulty internally (heater-to-signal short)
- PossibleOpen or high-resistance signal or ground wire (GM reads its bias voltage)
- RareSensor contaminated by silicone, coolant or oil
- 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: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.