Number P0155: O2 Sensor Heater Circuit Bank 2 Sensor 1
The upstream oxygen sensor on bank 2 (sensor 1) has its own electric heater. P0155 is the bank 2 counterpart of P0135: the heater current is outside its window or the driver voltage does not follow the command. GM fails it outside 0.3–3.1 A (8 s or 8 of 10 samples, two trips); Ford outside roughly 0
Can you drive with P0155?
Severity: Plan the repair. Yes — this is an emissions-system fault. The car will generally drive normally, but it will fail an emissions inspection with the light on.
If you ignore it: Fuel economy and emissions creep up, and some faults in this family (rich/lean running) stress the catalyst over time.
This is the #6 most common code in our top-150 library, in the oxygen & exhaust sensors family (Powertrain system). Severity is Number Nest's editorial triage — if the light is flashing or the car feels unsafe, stop driving it whatever any page says.
What P0155 means
The upstream oxygen sensor on bank 2 (sensor 1) has its own electric heater. P0155 is the bank 2 counterpart of P0135: the heater current is outside its window or the driver voltage does not follow the command. GM fails it outside 0.3–3.1 A (8 s or 8 of 10 samples, two trips); Ford outside roughly 0.22–0.465 A minimum to 3 A, with related codes for heater temperature control (P0050) and resistance (P0059). Closed loop on bank 2 then starts late after a cold start, and the sensor checks are suspended. P0135 together with P0155 points to a shared supply or fuse.
Systems involved: oxygen sensor heater bank2 sensor1, oxygen sensor heater circuit, fuses.
Causes, ranked by likelihood
| # | Cause | Likelihood |
|---|---|---|
| 1 | Heater element of the sensor burnt out (sensor must be replaced) | most likely |
| 2 | Fuse or relay of the heater supply faulty | possible |
| 3 | Heater wiring or connector open, corroded or shorted | possible |
| 4 | Heater driver in the control module faulty | less common |
Check them in order — the list is ranked so the likely, cheaper causes come before the expensive part.
Symptoms you may notice
- Check engine light on
- Higher emissions and consumption after cold start
- Follow-up codes P0153/P0154 possible
Misdiagnosis traps
- Replacing the part named by the code title without testing. The code reports a failed self-test; the cause list above is ranked so the likely, cheap causes are checked before the expensive part is condemned.
- Clearing the code and declaring victory when the light stays off for a day — the monitor that sets this code runs only under specific driving conditions.
(General diagnostic guidance for this code family — no code-specific trap is published for this code.)
How a good shop confirms it
- Confirm the code and record any companion codes — companions narrow the system fast.
- Inspect the affected components and their wiring/connectors for damage, corrosion and looseness.
- Test the top-ranked cause with live data or a multimeter before replacing anything.
(Standard diagnostic path for this family, labeled as general guidance.)
Repair options & costs
| Repair | Shop total (parts + labor) | DIY (parts only) | Difficulty |
|---|
No single repair is costed for this code — the fix follows the diagnosis. The Repair Cost Estimator prices 28 common repairs once you know which one this is.
OBDex repair data for this code rates the job difficulty medium with a typical labor time in the 0.2–2 hour range and DIY possible: yes.
Check the federal emissions warranty first
Before you pay: federal law (the Clean Air Act emissions warranty) requires the manufacturer to cover the catalytic converter and the engine computer (PCM) for 8 years or 80,000 miles on 1995-and-newer cars, whichever comes first. California-emissions (CARB) states cover a longer list of parts for 7 years/70,000 miles, and PZEV-rated vehicles sold in CARB states carry 15-year/150,000-mile emissions coverage on many components. Check your warranty booklet or a dealer lookup before authorizing this repair out of pocket.
Frequently asked questions
How much does it cost to fix P0155?
There is no single fix — the code names a system, and the cost follows whichever cause on the ranked list proves out. The Repair Cost Estimator prices the common repairs in that system; diagnosis (often $100–$180, frequently credited) comes first.
Can I drive with P0155?
See the can-you-drive verdict above — it is based on the system involved and the cascading-damage risk, and it is our editorial triage, not a manufacturer instruction. If the light is flashing or the car feels unsafe, stop driving it regardless of any code.
Will P0155 clear itself?
If the fault was a one-off (a loose cap, a cold-start glitch), the light can go out after several clean trips and the code ages into history. A fault that is still present re-sets the code as soon as the car runs that self-test again — monitors run under specific conditions, which is why "it hasn't come back in two days" is not proof of a fix.
Will my car fail inspection with P0155?
In states with OBD-based emissions inspection, yes — an illuminated check-engine light or an incomplete readiness monitor fails the test regardless of what the tailpipe would show. C-codes (ABS) fall under safety inspection instead in states that have one.
What should I check first for P0155?
The first item on the ranked-causes list above — it is ranked likelihood-first for exactly this reason — plus the free checks: recent work in the area (connectors left loose are a classic), fluid levels, and the battery and grounds on electrical codes.
Where this data comes from
Code facts, causes and symptoms come from OBDex — an open dataset of independently authored descriptions of the standardized generic OBD-II codes (CC0 1.0, public domain; github.com/foerbsnavi/OBDex). The SAE J2012 document itself is copyrighted and is not reproduced here. Cost ranges are Number Nest's own US planning model: national parts and labor ranges cross-checked against the CarMD Vehicle Health Index 2026 published averages, with labor adjustable by the BLS OEWS May 2025 state wage index for auto technicians (occupation 49-3023) — a wage index, not a surveyed shop rate. Severity and can-you-drive notes are our editorial triage, not a manufacturer instruction.