Learn why lean trouble codes P0171 and P0174 often point to other engine problems instead of faulty oxygen sensors.

That Check Engine light can mean so many different things, as can any noticeable difference in your car's performance or weird sounds. Fortunately, there are ways to narrow down the problem using ...

P0171 is a diagnostic trouble code that means the engine’s air-to-fuel mixture on Bank 1 is too lean, with too much air relative to the amount of fuel being delivered. The most common cause is a ...