Emissions code
P0050: Upstream oxygen sensor heater control problem (bank 2)
How much to fix P0050? Typically $100–$350.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $40 | $180 |
| Labor: 0.6 to 1 hours × $110 to $150 an hour | $66 | $150 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $100 | $350 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
This is the range for the most common fix, oxygen sensor replacement (one sensor). Which repair your car needs depends on a proper diagnosis.
The computer controls the heater in the oxygen sensor in front of the catalytic converter on the side without cylinder 1, and it checks that control circuit. It found a fault on bank 2 that did not fit a clear low or high pattern. The sensor may warm up slowly after a start.
- Safe to drive?
- Usually yes, for now
- Most common cause
- Failed sensor heater
Safe to drive. The light stays on.
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What you may notice
- Check-engine light on
- Slightly worse fuel economy
- Rough idle for the first minute
Common causes, most likely first
- Failed sensor heater
- Wiring fault
- Blown fuse
- Computer driver
Check this first
Check the oxygen sensor heater fuse in the fuse box, and look at the plug on the bank 2 sensor for green corrosion or a loose latch. A blown fuse stops the heater just as a bad sensor would.
Other repairs that sometimes fix P0050
| Repair | Typical range, US |
|---|---|
| Diagnostic scan (check engine light) | $55 to $250 |
Before you pay
- Ask the shop what test showed this part is the cause, not just that the code appeared.
- Ask for parts and labor listed separately, and for the hours.
- Ask for a written OK before any extra work. Many states require written authorization before repairs.
Got a quote already? Check it against the range. Want to see if your car has a recall tied to this problem? Check recalls by VIN.
Need to read a code yourself? OBD-II scanners on eBay (affiliate link, disclosure).
P0050 questions
Heater purpose?
It gets the sensor hot quickly so the computer can control fuel right after a start. Without it the sensor takes minutes to wake up, and the engine runs less cleanly during that time.
Wiring?
Look at it after the fuse. A broken or chafed wire to the bank 2 sensor can cause this code, and a wiring repair is much cheaper than a replacement sensor.
Cost?
Moderate. The sensor is the main cost, and labor depends on how reachable it is. Ask for the estimate to show which bank sensor is being replaced so you can compare quotes.
How much does it cost to fix P0050?
The most common fix, oxygen sensor replacement (one sensor), has a typical range of $100 to $350 across the US. It is an estimate built from parts prices and local labor wages, not a quote. Your car and shop change it.
Typical range in 10 metro areas
Only the labor rate changes between cities. Same parts, same hours.
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $110 to $370 |
| New York City area | $110 to $360 |
| Los Angeles area, California | $110 to $370 |
| Chicago area, Illinois | $100 to $350 |
| Houston area, Texas | $100 to $340 |
| Dallas-Fort Worth area, Texas | $100 to $340 |
| Phoenix area, Arizona | $100 to $350 |
| Atlanta area, Georgia | $100 to $350 |
| Miami area, Florida | $100 to $350 |
| Seattle area, Washington | $110 to $370 |
Related codes
- P0051: Upstream oxygen sensor heater control low (bank 2)
- P0155: Upstream oxygen sensor heater circuit problem (bank 2)
More emissions codes
Code meaning written in our own words. Some codes mean different things on different makes, so check your scan tool or manual. Not a repair shop, estimates only.