P0174 on a Honda Accord
P0174 means system Too Lean (Bank 2). On the Accord, a few causes come up far more than others.
What P0174 usually means on a Accord
P0174 reports a lean condition on bank 2, so it applies to V6 Accords with their two cylinder banks. Seeing P0171 and P0174 together usually means a shared cause - a dirty MAF, a PCV leak, or weak fuel supply - rather than two separate bank problems. A single-bank P0174 points to a leak local to the front bank. Persistent lean running can aggravate misfires and cat-efficiency codes.
Most common causes on the Accord
- Dirty MAF sensor
A contaminated MAF leans both banks and is the common cause when P0171 and P0174 appear together.
- PCV or vacuum leak
A shared vacuum leak drives both banks lean.
- Bank-2 intake gasket leak
A front-bank gasket leak leans only bank 2 on the J35.
- Weak fuel delivery
A failing pump or clogged filter starves both banks under load.
What P0174 costs to fix on a Accord
If both banks read lean, clean or replace the MAF and smoke-test for leaks before anything invasive - inexpensive steps. A bank-2 gasket is more labor than bank 1 but still short of major-repair territory. Fuel-supply faults are the costlier, less common outcome.
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 Accord
Related symptoms
Honda Accord problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0174 behavior is covered on the main P0174 page. Confirm with a scan tool before buying parts.
P0174 on your Accord?
Every problem becomes a Case. Tell Redline what your Accord 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.