OBD codes / P0174 / Honda Accord
P0174 on a Honda Accord
System Too Lean (Bank 2)
J35 3.5 V6 Accord.
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 likely causes on this model
- 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 it costs 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. Get a diagnosis for your Accord — it weighs these causes against your exact configuration and real complaint data.
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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.