Here are the most common causes of P0171 + P0174. Idle Issues– With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.It should resolve when you get the air/fuel mixture issue fixed. If you have this code along with P0171 and P0174, ignore the P0300. Misfire– If the air fuel mixture has gotten too far from factory specs, this can cause the vehicle to misfire or run rough.Fuel Mileage- may or may not suffer depending on how much the air fuel mixture has changed.Here are the typical symptoms that something is wrong when your 6 has codes P0174 and P0171. For most people the first sign that anything is wrong at all is the service engine soon light coming on. There aren’t always drivability issues associated with these codes. It can be other things as well, but the intake manifold gasket is a great place to start. When these codes both appear at the same time, it is more often than not the intake manifold gasket that is the cause of the problem. The engine then makes adjustments to compensate and throws these codes, which trigger the service engine soon light. They are both thrown when the oxygen sensors detect that there is not enough oxygen in the exhaust. P0171 and P0174 occur when the air/fuel mixture on the vehicle gets too lean. It could be getting too much air (think vacuum leak, EGR problem, or mass airflow sensor) or it is not getting enough fuel (bad injectors, weak fuel pump, dirty fuel filter, bad fuel pressure regulator). There are a few reasons that a vehicle will get a lean condition. Lean Condition Meaning: The engine is bringing in too much air to the amount of fuel present.On inline engines, this code is not available, since there is only one “bank” of cylinders.
P0174- Fuel Trim System Lean → Bank 2: P0174 indicates that the side of the engine with the first cylinder (Bank 2) is running lean.P0171– Fuel Trim System Lean → Bank 1: P0171 indicates that the side of the engine with the first cylinder (Bank 1) is running lean.
Definitionīoth of these codes are generic, which means they have the same meaning (6 or not). When they appear together, it indicates that the entire engine is running lean. By themselves, these are some of the most common OBD2 codes. P0171 and P0174 both indicate that there is a lean condition present in your Mazda 6.
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