Emissions
Code P0155
O2 Sensor Heater Circuit Bank 2
Plain English Meaning:Oxygen sensor heater not working
✅
Green: Safe to Drive
Minor issue
P0155 Symptoms
- •Check engine light slow warmup
Most Common Causes of P0155
1Aging sensor wiring issue
P0155 Repair Playbook
Required Mechanic Tests
A qualified shop should perform these tests before replacing any parts to ensure they aren't guessing:
Check heater circuit
Typical Fix Paths & Estimated Costs
Replace sensor $100–$300
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Parts for P0155 Repair
Common replacement parts for emissions codes. (Paid links)
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