All codes › P0155
P0155: O2 Sensor Heater Circuit (Bank 2 Sensor 1)
What it means
The heater circuit in the bank 2 upstream O2 sensor has failed.
Severity: Low Emissions only.
Common causes
- Burned-out heater
- Blown fuse
- Wiring damage
- Connector fault
Most common causes first. Exact causes vary by make, model and engine.
Can I fix it myself?
Sometimes DIY. Rear-bank access can be tight; a swivel O2 socket helps.
Repair cost
SEEDED ESTIMATE Roughly $90–$410
Most likely repair: oxygen sensor. Diagnosis fees, taxes and other causes are not included.
| Line | Low | High | Basis |
|---|---|---|---|
| Oxygen sensor | $36 | $168 | Typical listed retail range, source |
| Labor 0.5–1.5 hr | $50 | $240 | $100–$160/hr, shop survey |
⚠️ This is an editorial placeholder range for this type of repair. It is not based on real invoices or licensed pricing data yet. Real ranges will appear here once enough reader invoices for P0155 are verified.
Verified reader invoices for P0155: 0. Share your repair bill to help build real costs.
Tools that can read P0155
- ScanFixAI: Pro $29.99/mo or $249.99/yr
- OBDAI: Annual PRO bundle $299
- BlueDriver Pro Next-Gen: $119.95 list ($99.95 sale seen)
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