What Does P0174 Mean on Your 2024 Mercedes-Benz GLE?
A P0174 code on your 2024 Mercedes-Benz GLE (W167) means the engine control unit has detected a lean fuel condition on Bank 2. The 2024 GLE 450 uses the M256 3.0L turbocharged inline-six with EQ Boost 48-volt mild hybrid system, producing 375 horsepower. The GLE 350 uses the M264 2.0L turbo-four. Either engine running lean under boost requires prompt attention.
Symptoms You Might Notice
- Check engine light illuminated
- Rough or unstable idle
- Reduced power and boost response
- Lower fuel economy
- Hesitation under acceleration
- Possible whistling from turbo piping
Common Causes of P0174 on the 2024 GLE
The GLE's turbocharged engines have several potential failure points for lean codes:
- Boost Leak — Charge pipe connections, intercooler hoses, or turbo inlet seals can leak pressurized air.
- Vacuum System Leak — Various vacuum-operated systems can develop leaks at connections.
- Fuel Injector Issue — A clogged or weak direct injector limits fuel delivery to affected cylinders.
- MAF Sensor Defect — A contaminated or defective mass airflow sensor causes metering errors.
How to Diagnose the Problem
- Scan with Mercedes Star Diagnostic or compatible tool.
- Monitor fuel trim adaptations — above +10% confirms lean.
- Inspect charge pipes and intercooler connections for leaks.
- Check all vacuum hoses and connections.
- Smoke test the boost and intake system.
- Test fuel pressure under load.
Repair Options and Estimated Costs
- Boost leak repair: $300–$700. Parts and labor vary by engine.
- Vacuum leak repair: $150–$450.
- Fuel injector replacement: $600–$1,400. Requires Mercedes-specific tools.
- MAF sensor replacement: $250–$550.
Can You Still Drive?
Drive gently for short distances. Your 2024 GLE is under Mercedes-Benz's warranty. Schedule a dealer service appointment to have the issue resolved under warranty coverage.
Prevention Tips
- Utilize your Mercedes-Benz warranty for all powertrain codes.
- Use premium fuel (91+ octane) as specified.
- Follow the service schedule precisely.
- Keep the engine air filter clean.
- Never ignore dashboard warning lights.