OBD-II Code · Sensors
P0152
O2 Sensor High Voltage (B2S1)
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$150–$400
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Bank 2 upstream sensor voltage high.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Black smoke
Likely causes
- Rich conditionMost common
- Failed sensor
- Contamination
Read the full diagnostic procedureP0152 is bank 2 upstream signal stuck HIGH — the bank-2 inverse of P0132.
P0152 is bank 2 upstream signal stuck HIGH — the bank-2 inverse of P0132. Engine appears permanently rich on bank 2.
Cheapest-first ladder
- check fuel trims; if B2 LTFT is pegged at -15 to -25%, the engine really IS rich on that bank — leaking injector on bank 2, stuck-open EVAP purge solenoid (purges typically dump into a specific intake runner, so they can bias one bank), failed FPR dumping fuel through the vacuum reference, or a bank-2-specific fuel rail leak.
- If fuel trims are normal, the signal is being held high by wiring — usually a heat-damaged connector where signal has bled into the heater B+ rail.
- Same FSM bank-verification rule applies: don't replace the wrong sensor.
Vehicle-specific patterns2004-2008 Dodge Ram 5.7L Hemi — longitudinal, bank 2 is driver side; throws P0152 from leaking driver-side injectors (Mopar TSB on injector pintle se…
- 2004-2008Dodge Ram 5.7L Hemi — longitudinal, bank 2 is driver side; throws P0152 from leaking driver-side injectors (Mopar TSB on injector pintle seal failure).
- 2006-2012Toyota RAV4 V6 / Highlander 2GR-FE — bank 2 is front (transverse); sets P0152 from FPR diaphragm tear dumping fuel into the manifold.
- 2008-2014Cadillac CTS 3.6L LLT direct-injection — bank 2 is front; throws P0152 from a stuck-open high-pressure injector.
- 2007-2013Nissan Pathfinder / Frontier VQ40 — bank 2 is driver side (longitudinal); sets P0152 from a saturated EVAP canister venting into the bank-2 intake runner. Cost band: $200-$500 for sensor; $400-$1,500 if a leaking injector or FPR is the real cause.
Look up another code
P0152 — frequently asked
What does a P0152 code mean?
Bank 2 upstream sensor voltage high.
What causes a P0152 code?
Common causes: Rich condition; Failed sensor; Contamination.
What are the symptoms of a P0152 code?
Typical symptoms: Check engine light; Black smoke.
Is it safe to drive with a P0152 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $150-$400.
How do I diagnose a P0152 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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