P0175 on Your 2023 Nissan Murano: What's Happening
The 2023 Nissan Murano is one of the final model years for this midsize crossover, powered by the reliable VQ35DE 3.5L V6 producing 260 hp with a Xtronic CVT. Bank 2 on the V6 is the front cylinder bank (cylinders 1, 3, 5). When the ECM triggers P0175, it means Bank 2 is consistently receiving more fuel than needed for the optimal air-fuel ratio. With a 2023 model, mileage is still relatively low, so the cause is often straightforward.
Noticeable Symptoms
- Check engine light on the dashboard
- Fuel economy below the rated 20-28 MPG
- Slightly rough idle
- Dark exhaust deposits on the tailpipe
- Reduced throttle response
- Possible fuel smell near the exhaust
Most Common Causes
1. MAF Sensor Contamination (High Likelihood)
Even at the lower mileage of a 2023 model (likely 15,000-35,000 miles), the MAF sensor can become contaminated in certain conditions. Dusty environments, frequent short trips, and use of over-oiled aftermarket air filters are the primary culprits. The VQ35DE's intake draws substantial air volume, and the MAF sensor's hot-wire element is sensitive to even thin films of oil or dust. A $10 can of MAF cleaner and 10 minutes of your time is the first diagnostic step.
2. Upstream O2 Sensor Issue (Medium Likelihood)
While premature at low mileage, the Bank 2 upstream O2 sensor can have early issues from fuel contamination, manufacturing variability, or exposure to silicone-based products. On the front bank, the sensor is positioned in a high-heat area of the exhaust manifold. A scan tool check of sensor response time will quickly determine if the sensor is healthy.
3. Fuel Injector Drip (Medium Likelihood)
Port fuel injectors on the VQ35DE can occasionally develop minor seal issues. While rare at low mileage, it can happen with manufacturing variability. A fuel pressure decay test is the best diagnostic -- connect a gauge and watch for pressure drop after engine shutdown. More than a 5 PSI drop in 5 minutes indicates a leaking injector.
4. Air Intake Leak After MAF Sensor (Low Likelihood)
If the air intake tube between the MAF sensor and throttle body has a crack or loose connection, unmetered air enters the engine. This confuses the ECM's calculations and can lead to incorrect fuel compensation. Inspect the intake tube, clamps, and any vacuum connections for loose or damaged components.
CVT Considerations
The 2023 Murano's CVT may behave slightly differently with P0175 active. Owners may notice the CVT seems less willing to settle at lower RPMs during cruising. This is the TCM responding to the engine's reduced efficiency. The behavior resolves when the fuel system is corrected.
Diagnostic Steps
- Scan for all codes and review freeze frame data.
- Check Bank 2 fuel trim data on a scan tool.
- Clean the MAF sensor with proper cleaner and clear codes.
- If the code returns, test the Bank 2 O2 sensor response.
- Perform fuel pressure and injector leak-down testing.
- Inspect intake plumbing for air leaks.
Warranty and Costs
The 2023 Murano is likely still under Nissan's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. If the P0175 cause is a covered component, the repair should be free at a Nissan dealer. Out-of-warranty costs: MAF cleaning $10-$15, MAF replacement $120-$260, O2 sensor $150-$330, fuel injector $120-$270 each.