P0175 on the 2022 Honda Accord
When your 2022 Honda Accord shows a P0175 code, the ECM has detected an overly rich air-fuel mixture on bank 2. The 2022 Accord (10th generation) offers two conventional engine options: the 1.5L turbocharged four-cylinder (192 hp) and the 2.0L turbocharged four-cylinder (252 hp), both with direct injection. There's also the 2.0L hybrid powertrain. The P0175 code applies to the conventional engines. Both the 1.5T and 2.0T use advanced turbocharging and direct injection that demand precise fuel management.
What You'll Notice
- Check engine light on the instrument panel
- Exhaust has a fuel-rich smell
- Rough or slightly unsteady idle
- Dark or black exhaust smoke during acceleration
- Gas mileage drops below the expected 26–33 mpg
- Possible spark plug fouling and associated misfires
Causes Specific to the 2022 Accord
1. O2 Sensor Malfunction (High Likelihood)
The oxygen sensors on the 2022 Accord monitor exhaust gas composition for real-time fuel trim corrections. A sensor on bank 2 that reads falsely lean — due to contamination, wiring damage, or internal degradation — will cause the ECM to add excess fuel. On the 2.0T, the bank 2 sensor placement is more exposed to heat, potentially accelerating degradation. Monitor both upstream and downstream sensor waveforms to identify the faulty unit.
2. Leaking Direct Fuel Injector (Medium Likelihood)
Both the 1.5T and 2.0T use high-pressure direct injection. The injector tips are exposed to extreme combustion temperatures and pressures, and carbon buildup or seal wear can prevent full closure. A leaking injector continuously adds fuel to its cylinder, creating a rich condition. On the 2.0T, the higher power output means higher injection pressures, which can accelerate injector wear. An injector balance test or leak-down test identifies the affected unit.
3. Fuel Pressure Running High (Medium Likelihood)
If the fuel pressure regulator or the high-pressure fuel pump doesn't back off properly, rail pressure stays elevated. On the 2022 Accord's turbocharged engines, the cam-driven HPFP works in conjunction with electronic pressure control. A faulty pressure sensor reading low will cause the system to command higher pump output. Monitor fuel rail pressure with a scan tool — compare it to Honda's published specifications for idle and loaded conditions.
4. Dirty or Failing MAF Sensor (Low Likelihood)
A MAF sensor that overreads airflow causes the ECM to inject more fuel than needed. On the 2022 Accord, this is uncommon but possible if the air filter hasn't been maintained or if an aftermarket intake was installed. Check MAF output against expected values and clean with MAF-specific cleaner as a first diagnostic step.
Diagnostic Process
- Check for related codes — P0172 (bank 1 rich), misfire codes, or EVAP codes can provide diagnostic direction.
- Monitor fuel trims — Negative LTFT values below -10% on bank 2 confirm the ECM is trying to correct a rich condition.
- Test O2 sensor performance — Compare bank 1 and bank 2 sensor response times and voltage ranges.
- Measure fuel pressure — Check high-pressure and low-pressure fuel system readings against Honda specs.
- Perform injector tests — Use the scan tool's injector balance test or monitor individual cylinder fuel trim corrections.
Repair Costs
- O2 sensor replacement: $100–$270
- Fuel injector replacement: $150–$420 per injector
- Fuel pressure regulator/sensor: $180–$380
- MAF sensor replacement: $90–$230
Warranty Status
The 2022 Accord should still be within Honda's 3-year/36,000-mile basic warranty. The powertrain warranty extends to 5 years/60,000 miles. O2 sensors are covered under the federal emissions warranty for 8 years/80,000 miles. Check your mileage and contact your Honda dealer — this repair may cost you nothing.
Driving Considerations
You can drive your Accord with P0175 for normal daily use, but address it within two weeks. Running rich can foul spark plugs, dilute engine oil (especially on the 1.5T), and gradually damage the catalytic converter. If you notice the 2.0T smelling strongly of fuel or running rough, get it looked at sooner.