What the P0172 Code Means for Your 2024 Volvo XC60
A P0172 diagnostic trouble code on your 2024 Volvo XC60 indicates that the engine control module has detected a rich fuel condition on Bank 1. The 2024 XC60 uses Volvo's 2.0-liter four-cylinder engine in B5 mild-hybrid (247 hp turbo) or B6 mild-hybrid (295 hp turbo-supercharged) configurations. Running rich means the combustion chambers are receiving more fuel than the optimal 14.7:1 air-fuel ratio calls for, leading to wasted fuel, higher emissions, and potential engine damage if left unaddressed.
Symptoms You May Notice
- Check engine light on
- Drop in fuel economy below the expected 23-29 MPG
- Black or dark gray exhaust smoke
- Rough idle or misfires
- Fuel smell from the tailpipe
- Reduced engine power or sluggish response
Most Common Causes of P0172 on the 2024 XC60
- Contaminated Mass Airflow (MAF) Sensor - The MAF sensor measures incoming air volume. Contamination from oil vapor or road debris causes it to underread airflow, making the ECM add too much fuel.
- Malfunctioning Fuel Injectors - The direct-injection fuel injectors on the 2.0L engine operate at very high pressures. A stuck-open or leaking injector over-fuels the affected cylinder.
- Degraded Upstream O2 Sensor - The pre-cat oxygen sensor on Bank 1 gives real-time feedback for fuel mixture adjustments. A slow or inaccurate sensor causes the ECM to run the mixture rich.
- Restricted Air Filter - An excessively dirty air filter limits airflow into the turbocharger and engine, disrupting the air-fuel balance.
How to Diagnose the Problem
Start by scanning for all stored trouble codes with an OBD-II tool. Note any secondary codes that might reveal a related issue. Pull up live data and check Bank 1 short-term and long-term fuel trims. Long-term fuel trim values consistently below -8% to -10% confirm the ECM is correcting for a rich condition. Inspect the air filter first for blockage. Examine the MAF sensor element for visible contamination and clean with MAF cleaner spray if needed. Check fuel pressure with a mechanical gauge to rule out fuel pressure regulator problems. Use the scan tool to monitor the upstream O2 sensor response rate and voltage. If the sensor is lazy or stuck high, it needs replacement.
Repair Options and What to Expect
On the 2024 XC60, cleaning the MAF sensor is a quick and inexpensive first step. If the sensor is damaged beyond cleaning, a new Volvo OE or quality aftermarket MAF sensor runs $100-$250 for the part. Fuel injector replacement requires removing the intake manifold on the direct-injection engine, making it a 2-3 hour shop job. O2 sensor replacement is a straightforward repair accessible from beneath the vehicle. Air filter replacement is the easiest DIY repair and can be done in under 10 minutes.
Estimated Repair Costs
- MAF Sensor Replacement: $160 - $380 (parts and labor)
- Fuel Injector Replacement: $350 - $750 (parts and labor)
- Upstream O2 Sensor Replacement: $220 - $480 (parts and labor)
- Air Filter Replacement: $30 - $60 (DIY)
Volvo dealer rates typically run $160-$210 per hour. Independent European-specialty shops can complete the same repairs for 25-35% less.
Prevention Tips
- Replace the air filter on schedule, typically every 15,000 miles
- Use the grade of fuel recommended in your owner's manual
- Have the MAF sensor inspected during routine oil changes
- Do not ignore the check engine light, as rich conditions can damage the catalytic converter
- Stay on top of the Volvo-recommended maintenance schedule