P0172 on a Honda CR-V
P0172 means system Too Rich (Bank 1). On the CR-V, a few causes come up far more than others.
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 common causes on the CR-V
- 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 P0172 costs to fix 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. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes 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.
P0172 on your CR-V?
Every problem becomes a Case. Tell Redline what your CR-V is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.