P0175 on Your 2024 Acura MDX: Rich Running on Bank 2
The 2024 Acura MDX continues with the 3.5L J35Y6 V6 (290 hp) in standard trims and the 3.0L J30A turbo V6 (355 hp) in the Type S. A P0175 code on a vehicle this new indicates the ECM has found bank 2 running richer than specification. On a 2024 model with minimal mileage, this almost certainly points to a sensor issue, contamination, or software calibration concern rather than wear-related failure.
Symptoms You'll Notice
- Check engine light on the MDX's 12.3-inch digital display
- Fuel economy below the rated 20/27 MPG (standard) or 17/22 MPG (Type S)
- Faint exhaust smoke during acceleration
- Idle roughness that doesn't match the MDX's luxury expectations
- Fuel odor from the exhaust
- On the Type S, potential turbo boost irregularities
What's Causing It on a Nearly New MDX
1. MAF Sensor Contamination
Even with low miles, the MAF sensor can pick up contamination from dusty commuting routes, construction zones, or an improperly seated air filter after a service. The MDX's intake draws from behind the grille where road debris is common. A dirty MAF causes incorrect airflow readings and subsequent over-fueling. Cleaning costs $10; OEM Acura replacement is $160–$290.
2. ECM Software Update Needed
Honda/Acura regularly releases ECM calibration updates, especially during the first few years of a vehicle generation. A fuel map refinement via software update can resolve P0175 without any parts replacement. Your Acura dealer can check for applicable updates — this service is free under warranty.
3. Manufacturing Defect in Fuel Injector
On a 2024 model, an injector flowing above specification is likely a manufacturing defect. Honda's quality control is generally excellent, but individual injector variances can occur. This is a warranty repair. Out-of-warranty cost would be $150–$400 for injector replacement.
4. O2 Sensor Defect
A brand-new wideband A/F sensor can fail from manufacturing defects or contamination during assembly. If the sensor sends incorrect data, the ECM adjusts fueling incorrectly. This is another warranty-covered item, costing $180–$360 if paying out of pocket.
Diagnostic Approach
- Schedule an Acura dealer appointment — warranty-covered diagnosis is the right first step
- Have the dealer check for TSBs and ECM software updates
- Request documentation of fuel trim data showing the rich condition
- Verify no aftermarket accessories or modifications affect the intake system
- For Type S models, request boost system diagnostic verification
Safe to Drive?
Normal driving is fine short-term. The MDX's ECM compensates for the rich condition within its correction range. However, schedule a dealer visit within a week. The MDX's catalytic converters carry Acura pricing ($900–$2,000 each), and protecting them from rich exhaust damage is the financially smart move.
Warranty Covers Everything
The 2024 Acura MDX includes a 4-year/50,000-mile basic warranty and 6-year/70,000-mile powertrain warranty. All fuel system sensors, injectors, ECM programming, and turbo components (Type S) are fully covered. There is no reason to pay for P0175 diagnosis or repair on a 2024 model. Simply contact your Acura dealer and schedule the service.