P0171 on Your 2024 Jeep Wrangler
A P0171 code on your 2024 Jeep Wrangler means the engine is running lean on Bank 1. The 2024 Wrangler offers a 3.6-liter Pentastar V6 producing 285 horsepower or a 2.0-liter turbocharged inline-4 making 270 horsepower. The V6 has two cylinder banks, while the turbo-4 has one. Bank 1 on the Pentastar V6 is the rear bank near the firewall.
The ECU monitors the air-fuel ratio and stores P0171 when Bank 1 fuel trims can't compensate for the lean condition.
Symptoms
- Check engine light on
- Rough idle
- Hesitation during acceleration
- Reduced power, especially off-road
- Poor fuel economy
- Hissing or whistling from the engine
Common Causes
- Vacuum Leaks - The Wrangler's engine bay is exposed to more dirt, moisture, and temperature extremes than most vehicles, accelerating hose deterioration. Off-road use can jostle connections loose.
- MAF Sensor Contamination - Dust and water exposure from off-road driving can quickly contaminate the MAF sensor.
- Fuel Injector Issues - Dirty injectors on Bank 1 reduce fuel delivery.
- Fuel Pump Problems - A weak fuel pump or clogged filter.
Diagnosis
- Full code scan - Check for P0174 (Bank 2 lean on V6) and misfire codes.
- Fuel trim analysis - Compare banks on the V6.
- Smoke test - Find vacuum leaks.
- MAF sensor test - Check for contamination.
- Fuel pressure test - Verify adequate delivery.
Repair Costs
- Vacuum hose repair - $75 to $275
- MAF sensor replacement - $160 to $350
- Fuel injector replacement - $300 to $650
- Fuel pump replacement - $500 to $900
Diagnostic fee: $120 to $175.
Warranty
Your 2024 Wrangler is under Jeep's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Take it to a Jeep dealer for covered repair.
Prevention Tips
- Follow Jeep's maintenance schedule, especially if you go off-road
- Replace the air filter more frequently if you drive on dirt roads
- Inspect vacuum hoses and connections after off-road trips
- Use quality fuel
- Clean or check the MAF sensor periodically if you frequently drive in dusty conditions