P0175 on the 2016 Toyota Camry
A P0175 code on your 2016 Toyota Camry means bank 2 is running rich. The 2016 Camry (7th generation) offers the 2.5L 2AR-FE four-cylinder (178 hp) with port fuel injection or the 2GR-FE 3.5L V6 (268 hp). At 8-10 years old with potentially 100,000-160,000 miles, wear-related issues dominate the P0175 diagnosis. The V6 model has a distinct bank 2 with separate O2 sensors, while the 2.5L four-cylinder monitors fuel trims through a single sensor set.
Symptoms
- Check engine light on
- Strong fuel smell from exhaust
- Black soot at the tailpipe
- Rough idle or vibration
- Gas mileage well below the rated 22–35 mpg
- Misfires, stumbling, or hesitation
Root Causes at High Mileage
1. Worn Out O2 Sensor (High Likelihood)
At 100,000+ miles, your 2016 Camry's O2 sensors are past their typical service life. The sensing element degrades from millions of thermal cycles, causing sluggish response and biased readings. On the 3.5L V6, the bank 2 upstream sensor is dedicated to the rear cylinder bank. On the 2.5L, the single upstream sensor controls fuel for all four cylinders. Replacement O2 sensors for the 2016 Camry are very affordable at $40-$100 for quality aftermarket units.
2. Aged Fuel Injectors (Medium Likelihood)
After 100,000+ miles, port fuel injector O-rings harden and the injector pintles may not seal completely. The 2.5L's injectors are simple port units, and the V6's injectors are similar. A leaking injector drips fuel continuously, enriching its cylinder. Inspect bank 2 spark plugs — fuel fouling identifies the problem injector. Replacement injectors for the 2016 Camry are $30-$80 each for aftermarket units.
3. Fuel Pressure Regulator Failure (Medium Likelihood)
After 8-10 years, the fuel pressure regulator diaphragm is a common failure point. When it ruptures, fuel leaks into the vacuum line and fuel pressure increases. This is the classic high-mileage rich condition. Test by disconnecting the vacuum line and checking for fuel. Measure rail pressure — it should be approximately 44-50 psi at idle (varies by engine).
4. Saturated EVAP Canister (Low Likelihood)
If the gas tank has been repeatedly overfilled over the years, the charcoal canister may be saturated with fuel. When the purge valve opens, liquid fuel enters the intake. Check for fuel smell near the canister and inspect the purge line for liquid fuel.
Diagnostic Process
- Read all codes — Check for catalyst efficiency codes that indicate additional problems.
- Check fuel trims — LTFT below -15% indicates severe rich condition.
- Test O2 sensors — Monitor switching frequency and compare to specification.
- Inspect spark plugs — Look for fuel fouling patterns.
- Test fuel pressure regulator — Check vacuum line for fuel and verify rail pressure.
Repair Costs for 2016 Camry
The 2016 Camry is one of the most affordable cars to maintain:
- O2 sensor: $70–$200
- Fuel injector: $70–$250 per injector
- Fuel pressure regulator: $100–$250
- EVAP canister: $130–$300
- Spark plugs: $40–$80 (four-cylinder) or $70–$130 (V6)
Extremely DIY Friendly
The 7th-gen Camry is one of the easiest cars to work on. The 2.5L engine bay has enormous amounts of space. O2 sensor replacement takes 30-60 minutes with basic tools. Port fuel injectors are accessible on both engines. The fuel pressure regulator test is a 5-minute check. Toyota Camry repair guides are among the most abundant online. Even a first-time DIYer can tackle most P0175 repairs on this car.
Why You Should Fix It
Your 2016 Camry is worth maintaining — these cars regularly run 200,000+ miles with proper care. But running rich wastes fuel, fouls plugs, and kills catalytic converters. At this age, the converter is already aging, and running rich can push it into failure. Converter replacement on a 2016 Camry runs $400-$1,200. Fix P0175 with a $70-$250 repair and keep your Camry going strong.