What P0175 Means on the 2018 Toyota Camry
The P0175 code on your 2018 Toyota Camry means bank 2 is running rich — excess fuel in the combustion mixture. The 2018 was the first year of the 8th-generation Camry, introducing the 2.5L Dynamic Force four-cylinder (203 hp) with D-4S dual injection and the carryover 3.5L V6 (301 hp). At 6-8 years old with potentially 80,000-120,000 miles, wear-related sensor and injector failures are the primary suspects.
Symptoms
- Steady check engine light
- Strong gasoline smell from exhaust
- Black soot at the tailpipe
- Rough idle or engine shake
- Fuel economy significantly below the rated 22–41 mpg
- Misfires from fouled spark plugs
Common Causes at This Mileage
1. Worn O2 Sensor (High Likelihood)
At 80,000+ miles, the O2 sensors on your 2018 Camry have reached their typical service life. A degraded sensor with slow response or lean bias causes the ECM to overfuel. On the V6, the bank 2 upstream sensor controls that bank specifically. On the 2.5L, the primary sensor controls all cylinders. Toyota recommends O2 sensor inspection at 80,000 miles. Replacement is the most common and cost-effective fix for P0175 on a Camry of this age.
2. Leaking Fuel Injectors (Medium Likelihood)
After 6+ years of service, injector seals can harden. On the V6, bank 2 port injectors may not seat properly. On the 2.5L D-4S, both port and direct injectors can develop issues, though the direct injectors are more prone to carbon buildup affecting seal quality. Pull spark plugs from bank 2 — a fuel-fouled plug identifies the leaking injector.
3. Fuel Pressure Regulator Wear (Medium Likelihood)
The fuel pressure regulator's diaphragm can deteriorate over years. When it fails, fuel pressure rises, and every injector delivers excess fuel. Test fuel rail pressure at idle — Toyota specifies specific PSI ranges for each engine. Check the regulator vacuum line for fuel contamination (V6).
4. Catalytic Converter Deterioration (Low Likelihood)
At this mileage, the catalytic converter may be losing efficiency. A deteriorating converter can affect downstream O2 sensor readings, indirectly causing the ECM to mismanage fuel. This is a secondary consideration after addressing the primary suspects.
Diagnostic Steps
- Scan for all codes — Check for catalyst efficiency codes (P0420/P0430) alongside P0175.
- Monitor fuel trims — LTFT below -12% confirms the ECM is aggressively cutting fuel.
- Test O2 sensors — Monitor response time at steady cruise. Should switch 6-8 times per 10 seconds.
- Inspect spark plugs — Check for fuel fouling on bank 2 cylinders.
- Verify fuel pressure — Test at idle, under load, and key-off bleed-down.
Repair Costs for 2018 Camry
- O2 sensor: $80–$230
- Fuel injector: $100–$300 per injector
- Fuel pressure regulator: $120–$280
- Spark plugs: $50–$100 (four-cylinder) or $80–$150 (V6)
DIY Friendly
The 8th-gen Camry is very accessible for DIY work. The 2.5L engine bay has excellent access to the O2 sensors, spark plugs, and MAF sensor. The V6 has more components but bank 2 access is better than many competitors. O2 sensor replacement is a beginner DIY job. Spark plug inspection takes 20-30 minutes. Use penetrating oil on O2 sensor threads — they'll be corroded after 6+ years.
Act Promptly
At this age and mileage, the catalytic converter is aging. Running rich accelerates catalyst degradation. A replacement converter for the 2018 Camry costs $500-$1,500 — far more than fixing the root cause of P0175. The Camry's known reliability makes it worth maintaining properly.