How do I fix the code P0171 on my Ford?

1. STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.
2. STEP 2: INSPECT VACUUM LINES.
3. STEP 3: INSPECT MASS AIR FLOW (MAF) SENSOR.
4. STEP 4: INSPECT EXHAUST SYSTEM.
5. STEP 5: CHECK FUEL PRESSURE.
6. STEP 6: REPLACE AIR-FUEL AND/OR O2 SENSORS.
7. STEP 7: INSPECT AND REPLACE SPARK PLUGS.

Can I drive with P0171?

Any time your check engine light is on, you should take the reading seriously. A P0171 code is no exception to this rule. When the engine stores this code, you should not drive your vehicle far, if at all. When your engine runs lean, there is not enough gasoline for it to run efficiently.

What causes engine code P0171?

What the P0171 code means. The P0171 OBD-II code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air.

How much does it cost to fix a system too lean Bank 1?

These problems cause the air-fuel mixture to be off and trigger the System too lean bank 1 code since the pump can’t get enough fuel to the engine. On average, this repair costs $870, where parts cost around $690 and labor costs around $180.

What is Bank 1 too lean?

The OBDII trouble code P0171 – System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher.

Can a cold air intake cause code P0171?

ANY cold air intake, should not throw codes or cause a lean condition. Lean conditions/codes happen when unmetered air “leaks” into the sysytem after the Mass Air Flow sensor – and before the T/B.

How much does it cost to fix P0171?

A broken vacuum hose sucking in air can be around $50, or a clogged fuel filter for $100. On the other hand, an oxygen sensor or mass air flow sensor can bring a bill of $400 to $500 dollars. A bad fuel pump can be really expensive costing around $600 to $800.

Can a dirty air filter cause a P0171 code?

If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.

How serious is P0171?

What Does Code P0171 Mean? 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.

Is P0171 serious?

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. Diagnosis: It is important to complete the entire diagnostic process when diagnosing P0171.

Can a bad O2 sensor cause P0171?

When the ECM/PCM is having to add too much fuel based on input from the O2 sensor, the fault code P0171 will be sent to the ECM, which will trigger the check engine light to illuminate. This code could either mean that the oxygen sensor is detecting too much oxygen or too little fuel in the mixture.

Can a loose gas cap cause P0171 code?

It doesn’t set a code that is false. A lean code from a vacuum leak, mass air flow failure, pcv valve bad or low fuel pressure is 171.

Can a bad air filter cause P0171?

Can a bad spark plug cause P0171?

Can bad spark plugs cause P0171? Not likely. A P0171 ( too lean, Bank 1 ) code is most often caused by a vacuum leak downstream from the MAF sensor or a malfunctioning MAF sensor. Bad spark plugs could actually cause the opposite code ( too rich, bank 1).