Emissions code
P2198: Upstream oxygen sensor stuck rich (bank 2)
How much to fix P2198? 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 oxygen sensor in front of the catalytic converter on the side without cylinder 1 keeps reading rich and does not swing back and forth as it should. The sensor may be dead, or the engine on that bank may really be getting too much fuel from a leaking injector or high fuel pressure.
- Safe to drive?
- Short trips only
- Most common cause
- Failed upstream sensor
Drive gently. A rich engine wastes fuel.
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What you may notice
- Poor fuel economy
- Black smoke
- Rough idle
- Check-engine light
Common causes, most likely first
- Failed upstream sensor
- Leaking injector
- Wiring short
- Fuel pressure too high
Check this first
Ask the shop to read fuel trims for bank 2. If the computer is pulling a lot of fuel out there, the engine is really rich and the injector or pressure is the issue. If trims are normal, the sensor is stuck.
Other repairs that sometimes fix P2198
| Repair | Typical range, US |
|---|---|
| Fuel injector replacement (one injector) | $170 to $820 |
| 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).
P2198 questions
Bank 2 means what?
Bank 2 is the side of the engine that does not hold cylinder 1. On a V-type engine, that is the opposite bank, and the shop can show which side it is on your car.
Is it the injector?
Possible. A leaking injector on that bank adds too much fuel and keeps the sensor reading rich. A fuel in the oil smell or very dark plugs on that side support that idea.
Will it return?
Not if the cause is fixed correctly. If the injector or pressure is the real issue and only the sensor is replaced, the code will come back, so the shop should find the cause first.
How much does it cost to fix P2198?
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 |
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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.