P0175 on the 2022 Volvo S60: Decoding the Problem
The 2022 Volvo S60 sedan runs Volvo's Drive-E 2.0L four-cylinder in B5 (turbo, 247 hp) or T8 Recharge (turbo + supercharged plug-in hybrid, 455 hp combined) form on the SPA platform. A P0175 code indicates the engine is running excessively rich — the ECM has detected fuel trim values beyond normal correction limits, meaning too much fuel is being delivered relative to the air entering the engine.
Symptoms to Watch For
- Check engine light illuminated
- Drop in fuel economy (the S60 normally achieves 30 MPG combined; expect 25–26 MPG)
- Black exhaust smoke
- Rough or surging idle
- Strong fuel smell at the tailpipe
- Potential performance limitation warning
Common Causes on the S60
1. MAF Sensor Contamination — High Likelihood
The S60's Bosch hot-film MAF sensor measures intake air for fuel calculations. The Drive-E engine's PCV system routes crankcase vapors back through the intake, and over time these oil-laden vapors coat the MAF element. This is the single most common cause of P0175 on the S60 and usually the first thing checked by Volvo technicians. The S60's sport-oriented driving style can accelerate this if the car is driven aggressively in city traffic.
2. O2 Sensor Degradation — Medium Likelihood
The upstream wideband O2 sensor on the S60 sits just downstream of the turbocharger. High exhaust temperatures from the turbo can cause gradual sensor degradation, leading to inaccurate air-fuel ratio readings. A sensor that reads slightly lean will cause the ECM to progressively add fuel, eventually triggering P0175.
3. Leaking Direct Fuel Injector — Medium Likelihood
The four direct injectors on the Drive-E engine operate at very high pressure. Carbon deposits can alter spray patterns, or a worn injector seal can allow fuel to seep past when the injector should be closed. On a 2022 S60 with typical mileage, this is more common on vehicles used primarily for short trips where the engine doesn't fully reach operating temperature.
4. PCV System Issue — Low Likelihood
The S60 shares the Drive-E PCV system that has been a known weak point across Volvo's lineup. A cracked PCV diaphragm or stuck valve can introduce excess crankcase gases into the intake, adding unmetered hydrocarbons and contaminating the MAF sensor. A telltale whistling sound from the engine area often accompanies PCV failure.
Diagnostic Steps
- Review fuel trims — Connect a scan tool and check STFT/LTFT. LTFT above +15–20% confirms persistent richness.
- Clean the MAF sensor — Remove (two Torx screws), clean with MAF-safe spray, air dry, reinstall. This often resolves the issue entirely.
- Inspect PCV system — Check for oil leaks around the PCV housing and listen for vacuum leaks.
- Test O2 sensor — Monitor voltage and switching frequency. A healthy sensor switches rapidly between 0.1V and 0.9V.
- Injector balance test — Use VIDA or equivalent to check individual cylinder contribution.
Repair Costs
Volvo dealer rates for the S60:
- MAF sensor cleaning: $10–$15 (DIY)
- MAF sensor replacement: $230–$420
- O2 sensor replacement: $280–$510
- Fuel injector replacement: $320–$610 per injector
- PCV system repair: $170–$430
Is It Safe to Drive?
You can drive the S60 for short trips, but don't delay repairs. The S60's catalytic converter is close-coupled and integrated near the turbo, making it expensive ($1,800–$3,000) to replace. Rich running is the primary cause of converter failure.
DIY or Professional?
MAF cleaning is an excellent DIY starting point — it's the most common fix and takes 15 minutes. If that doesn't resolve the code, professional diagnosis with VIDA is recommended for accurate O2 sensor testing and injector analysis.