What Does P0172 Mean on Your 2022 Toyota Camry?
The 2022 Toyota Camry comes with either a 2.5L Dynamic Force inline-4 producing 203 hp or a 3.5L V6 making 301 hp (TRD and XSE V6 trims). Hybrid models pair the 2.5L with an electric motor for a combined 208 hp. P0172 indicates the ECM has detected a rich fuel condition on Bank 1. On the four-cylinder, Bank 1 is the entire engine. On the V6, Bank 1 is the front bank of cylinders.
This code means the air-to-fuel ratio has too much fuel. The ECM has been trying to compensate by reducing fuel delivery, but the mixture remains too rich.
Common Symptoms You Might Notice
- Check engine light on
- Fuel economy noticeably worse
- Fuel or rotten egg smell from exhaust
- Black soot on tailpipe
- Rough or unstable idle
- Reduced power and throttle response
Top Causes of P0172 on the 2022 Camry
- Dirty MAF Sensor (35% likelihood): The MAF sensor on the Camry's intake tube collects contamination over time. On the 2.5L, PCV system oil vapor is the most common contaminant. A dirty sensor underreports airflow.
- Faulty Upstream O2 Sensor (25% likelihood): The Bank 1 upstream oxygen sensor may be degrading, causing delayed or inaccurate fuel trim feedback.
- EVAP Purge Valve Issue (20% likelihood): A stuck-open purge valve allows fuel vapors to continuously enter the intake manifold, enriching the mixture.
- Vacuum or Intake Leak (20% likelihood): Cracked hoses, loose clamps, or worn gaskets can introduce unmetered air that throws off MAF calculations.
How to Diagnose P0172 on Your 2022 Camry
- Check for additional codes. P0175 with P0172 (V6 only) means both banks are rich, pointing to the MAF or fuel pressure.
- Inspect and clean the MAF sensor. Remove it from the intake and spray with MAF-specific cleaner. Let it dry fully before reinstalling.
- Monitor fuel trims. LTFT below -10% confirms the ECM is actively correcting a rich condition.
- Check the EVAP purge valve. Disconnect the purge line at idle. If idle changes significantly, the valve may be stuck open.
- Inspect the air filter. A clogged filter restricts airflow and can contribute to rich running.
Repair Options and Costs
- MAF sensor cleaning: $10 DIY or $50-$90 at a shop
- MAF sensor replacement: $120-$250 parts and labor
- O2 sensor replacement: $150-$330 parts and labor
- EVAP purge valve replacement: $100-$240 parts and labor
- Vacuum leak repair: $60-$200 depending on location
Can You DIY This Repair?
The 2022 Camry is one of the most DIY-friendly cars for engine maintenance. The MAF sensor is easily accessible and takes 15 minutes to clean. The air filter is a 5-minute swap. The O2 sensor on the four-cylinder is accessible from underneath. The V6's Bank 1 O2 sensor is at the front, making it easier than many V6 vehicles.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Clean the MAF sensor every 30,000 miles
- Use top-tier fuel to minimize injector deposits
- Follow Toyota's maintenance schedule, including spark plug service
- Address check engine lights promptly to avoid catalytic converter damage