What Is the P0172 Code on Your 2022 Volvo S60?
A P0172 trouble code on your 2022 Volvo S60 means the engine control module has detected that Bank 1 of the engine is operating with a fuel mixture that is too rich. The 2022 S60 comes with a 2.0-liter turbocharged four-cylinder making 247 hp in T5 trim, or a turbo-supercharged version making 295 hp in the T6 trim. There is also the Recharge T8 plug-in hybrid with 400+ hp. All use direct fuel injection and sophisticated air-fuel management. When the system runs too rich, you waste fuel, produce more emissions, and risk engine damage over time.
Symptoms You May Notice
- Check engine light illuminated
- Fuel economy dropping below the normal 24-33 MPG range
- Black or dark exhaust smoke
- Rough or inconsistent idle
- Fuel smell from the exhaust
- Sluggish acceleration or engine stumble
Most Common Causes of P0172 on the 2022 S60
- Contaminated Mass Airflow (MAF) Sensor - Oil residue or debris on the MAF sensor element causes it to read lower-than-actual airflow, resulting in the ECM injecting too much fuel.
- Leaking Fuel Injectors - The high-pressure direct-injection system on the S60's 2.0L engine uses precise injectors that can develop leaks or fail to seat properly, flooding the cylinder with fuel.
- Failing Upstream O2 Sensor - A degraded oxygen sensor on Bank 1 sends incorrect exhaust gas data to the ECM, causing it to run the fuel mixture excessively rich.
- Clogged Air Filter - A severely dirty air filter restricts airflow into the turbocharged engine, pushing the air-fuel mixture toward the rich side.
How to Diagnose the Problem
Start with a full OBD-II scan to read all codes and freeze frame data. Check for companion codes that might narrow down the cause. Review Bank 1 short-term and long-term fuel trims. Long-term fuel trim consistently below -10% indicates the ECM has been compensating for a persistent rich condition. Check the air filter for blockage. Inspect and clean the MAF sensor with dedicated MAF cleaner spray. Measure fuel pressure with a gauge to rule out a faulty pressure regulator. Monitor the Bank 1 upstream O2 sensor output with a scan tool to verify proper switching between 0.1V and 0.9V at a normal rate.
Repair Options and What to Expect
The 2022 S60 shares its powertrain with other Volvo 60-series models, so parts availability is good. Cleaning the MAF sensor is the cheapest and easiest first step. If replacement is needed, a new MAF sensor is straightforward to install. Fuel injector replacement on the direct-injection engine requires removing the intake manifold and is best handled by a shop with European car experience. O2 sensor replacement is accessible from underneath the vehicle. Air filter replacement is a quick DIY job.
Estimated Repair Costs
- MAF Sensor Replacement: $140 - $340 (parts and labor)
- Fuel Injector Replacement: $300 - $700 (parts and labor)
- O2 Sensor Replacement: $190 - $430 (parts and labor)
- Air Filter Replacement: $20 - $50 (DIY)
As a luxury sedan, the S60 has moderate repair costs. Independent European car specialists typically charge 25-35% less than Volvo dealer rates of $160-$200 per hour.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Use premium fuel as recommended by Volvo for the turbocharged engine
- Have the MAF sensor inspected at regular service intervals
- Address the check engine light promptly to prevent catalytic converter damage
- Follow the Volvo maintenance schedule for optimal fuel system health