OBD codes / P0172 / Honda CR-V
P0172 on a Honda CR-V
System Too Rich (Bank 1)
1.5T (L15B) and K24 CR-V.
What P0172 usually means on a CR-V
P0172 tells you the CR-V is running rich - too much fuel for the air - the opposite of a lean code. On the 1.5-liter turbo, fuel dilution and injector issues make a rich code more plausible than on many engines, because raw fuel is already entering the system. On K24 cars a leaking injector or skewed sensor is more typical. Negative fuel trims and a fuel smell often accompany it.
Most likely causes on this model
- Fuel dilution or injector leak (1.5T)
Excess fuel from a leaking injector or diluted oil pushes the L15B rich.
- Faulty upstream air-fuel sensor
A biased front sensor commands too much fuel.
- High fuel pressure or leaking regulator
Over-pressure delivery enriches the mixture.
- Dirty air filter or restricted intake
Reduced airflow makes the fixed fuel look rich.
What it costs on a CR-V
Start cheap: inspect the air filter and read fuel trims and the front air-fuel sensor before replacing parts. An air-fuel sensor is a moderate cost on the CR-V. Injector or fuel-pressure repairs are the pricier outcomes and warrant confirmation first.
Year, engine and mileage change the answer. Get a diagnosis for your CR-V — it weighs these causes against your exact configuration and real complaint data.
Diagnose my CR-V free →Other codes we cover on the Honda CR-V
Related symptoms
Honda CR-V problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0172 behavior is covered on the main P0172 page. Confirm with a scan tool before buying parts.