What causes code P0171 and P0174?

Car Trouble Codes. A trouble code P0171 or P0174 means the oxygen sensor or Air-Fuel Ratio (AFR) sensor (in bank 1 [P0171] or bank 2 [P0174]) has detected a lean fuel mixture: either too much air or not enough fuel is going into the engine.

What can cause a P0174 code?

P0174 Causes

• Dirty or faulty mass airflow sensor.
• Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket.
• Weak fuel pump.
• Clogged or dirty fuel injectors.
• Clogged fuel filter.
• Exhaust leak.
• Faulty oxygen sensor.
• Faulty air-fuel ratio sensor.

What is P0171 code for Ford?

A Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).

What does Ford code P0171 mean?

What Does Code P0171 Mean for Your Ford? P0171 definition: Bank 1 has too much air or not enough fuel. Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters.

What is po174 code on Ford?

What the P0174 code means. Code P0174 indicates that there is a lean condition detected by the Engine Control Module (ECM). A lean condition will be created if there is too much air, and not enough fuel, in the air fuel ratio (AFR).

What is P0174 code for Ford?

Diagnostic trouble code (DTC) P0174 stands for “System Too Lean (Bank 2).” The code indicates that your car’s computer has detected a lean running condition.

What does code P0175 mean?

What Does Code P0175 Mean? P0175 definition: Bank 2 has too much fuel or not enough air. Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters.

How do I fix my Ford P0174?

Ford TSB 03-16-1 says the fix involves several steps: remove the upper manifold plenum and replace the original gaskets and bolts with revised ones, replace the front valve cover with a revised valve cover that reduces the amount of oil vapor sucked into the PCV system, inspect and replace the fuel pressure regulator …

How do I fix code P0172 and P0175?

How to Fix P0172 and P0175. If the cooling temperature is good, the air filter is clean, the engine oil is not diluted and there are no other trouble codes, you may try cleaning the MAF sensor. Regardless if this is the issue, a good maintenance cleaning is always good, especially during air filter replacement.