Powertrain, generic · Fuel and air metering

P0152 O2 Sensor Circuit High Voltage Bank 2 Sensor 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Signal wire shorted to the heater supply or battery voltage (melted or chafed harness)
Sensor faulty internally (heater-to-signal short)
Open or high-resistance signal or ground wire (GM reads its bias voltage)
Sensor contaminated by silicone, coolant or oil

Symptoms

  • Check engine light on
  • Higher consumption, possibly rough running (no mixture control)
  • Higher CO/HC values
  • Often with P0158 or P0155

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–350
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Check fuel trims and fuel pressure
  2. Inspect wiring
  3. Replace sensor if contaminated

Parts involved

oxygen sensor bank2 sensor1oxygen sensor wiringengine control module

Related codes

P0132P0150P0151P0154P0158P0175

References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk, saabwisonline.com.