OBD-II Code · Sensors
P0050
O2 Sensor Heater Control (B2S1)
Severity
low
Lowest on our scale. Fix it when convenient.
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–$350
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Bank 2 upstream heater control.
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
Likely causes
- Failed heaterMost common
- Wiring
Read the full diagnostic procedureP0050 is the Bank 2 mirror of P0030 — the heater control circuit for the upstream O2 sensor on the bank that does NOT contain cylinder #1.
P0050 is the Bank 2 mirror of P0030 — the heater control circuit for the upstream O2 sensor on the bank that does NOT contain cylinder #1. Only V-configuration engines (V6, V8, V10) and some opposed engines have a Bank 2. The diagnostic path is identical to P0030 but on the opposite side of the engine.
Cheapest-first
- ohm the upstream Bank 2 sensor cold at the connector — 2-10 ohms narrowband, 1-3 ohms wideband.
- Verify the heater fuse (often shared with Bank 1, so a blown fuse usually sets P0030+P0050 together — if you only see P0050, the fuse is good).
- Key-on, confirm 12V at the supply pin, then scope the ground-side PWM during the first 60 seconds.
- Heater current 0.5-2A peak, closed-loop entry inside 30-90 seconds.
- Pay attention to whether the code sets alone or with its Bank 1 twin — paired codes point to a shared fuse, ground, or PCM power feed; isolated codes point to the specific bank's harness or sensor.
- Expensive misdiagnosis: replacing both upstream sensors when only Bank 2 is faulty — confirm by swapping the suspect sensor to the opposite bank and seeing if the code follows.
Vehicle-specific patternsGM 5.3L/6.0L/6.2L LS trucks and SUVs (Silverado/Tahoe/Yukon/Escalade 2007-2014) chronically melt the Bank 2 upstream harness onto the passenger-side…
GM 5.3L/6.0L/6.2L LS trucks and SUVs (Silverado/Tahoe/Yukon/Escalade 2007-2014) chronically melt the Bank 2 upstream harness onto the passenger-side manifold heat shield — same TSB family as P0030 but mirrored. Ford 5.4L 3V (F-150/Expedition 2004-2010) Bank 2 upstream connector corrodes from cowl-drain runoff on the passenger side. Toyota 2GR-FE (Camry V6/Sienna/Avalon 2007-2014) Bank 2 wideband AFR sensors fail with age similar to Bank 1, Denso 234-9052 for the rear bank. Chrysler 5.7L HEMI (Ram 1500/300/Charger 2005-2014) Bank 2 upstream wiring chafes at the engine-to-firewall bracket.
Estimated repair$120 to $450.
Look up another code
P0050 — frequently asked
What does a P0050 code mean?
Bank 2 upstream heater control.
What causes a P0050 code?
Common causes: Failed heater; Wiring.
What are the symptoms of a P0050 code?
Typical symptoms: Check engine light.
Is it safe to drive with a P0050 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-$350.
How do I diagnose a P0050 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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