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What Is Code Po171?

The P0171 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.Apr 6, 2016

Is it OK to drive with P0171 code?

It is okay to drive a vehicle with P0171 for a short period of time, but driving with this code for an extended period of time can overheat the engine and cause internal engine damage.

What could cause a P0171 code?

This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or because your fuel system is weak. P0171 is a common trouble code in many vehicles. … If there is too much air, the ECM or PCM overcompensates with larger fuel injections, which triggers the P0171 code.

How much does it cost to fix code P0171?

What is the cost to resolve a P0171 code? This code will require a diagnostic check, which will run about $100 depending on the time it takes to find the issue. As there is a laundry list of reasons why the engine runs lean, the average price per repair will vary greatly.

Can a bad O2 sensor cause a P0171?

You probably know that the answer the questions is — no! A P0171 or P0174 lean code with an O2 sensor reading lean all the time mean — well, several things. The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean.

Can a vacuum leak cause P0171?

A: In the 2002 Corolla, the code P0171 is often caused by a bad or dirty mass airflow sensor or vacuum leaks. … If the mass airflow sensor is causing the lean condition, cleaning it may help, but usually, it will need to be replaced.

Where is the MAF sensor located?

MAF sensors are located between the air filter and the throttle body and are responsible for measuring the amount of air entering the engine. Most vehicles have a hot wire MAF sensor.

How do I fix code P0171?

What repairs can fix the P0171 code?

Replacing the fuel pump.
Replacing the fuel filter.
Replacing the fuel pressure regulator.
Replacing the powertrain control module.
Replacing one or more injectors.
Replacing one or more oxygen sensors.
Replacing the mass air flow sensor.
Repairing a vacuum leak.

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Can bad spark plugs cause P0171?

Can bad spark plugs cause p0171? – Quora. 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.

How do I fix code P1101?

What repairs can fix the P1101 code?

Replace or repair any faulty, damaged, or loose wiring, connectors, or components within the MAF sensor harness.
Clean or replace the air filter if it is dirty.
Clean the MAF sensor with specialized cleaner. …
Repair any leaks within the vacuum system.

What would cause an engine to run lean?

Your engine runs lean if your air-to-fuel mixture is too light – this means that the fuel in your ignition chamber is being igniting with too much air or too little fuel. … Your engine running lean is always a symptom of another problem – it could be a dirty MAF sensor, a damaged oxygen sensor, or damaged fuel injectors.

How do you fix a car that is running lean?

What causes P0171 and P0174 codes?

Code P0171 indicates Bank 1 of the engine has a lean fuel mixture. … P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust.

Why is my check engine light still on after changing O2 sensor?

The check engine light could be caused by more than one problem. Your oxygen sensor may have been replaced by the technician, but your spark plugs need to be replaced as well.

What side of the engine is Bank 1?

Bank 1 and bank 2 simply refer to either side of the engine. Check your owner’s manual or a service manual for a positive location of bank 1 and bank 2. Most commonly, bank 1 houses the front most cylinder on the engine cylinder 1, and bank 2 is the opposite side of the engine.

What is a P0171 code for a Chevy?

What Does P0171 Mean For Your Chevrolet? Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered.

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How do I check for a vacuum leak?

How do you fix lean air/fuel mixture?

Vacuum leak: Vacuum leaks can cause a lean fuel mixture. Inspecting and replacing damaged vacuum lines with good hoses and clamps can solve a lean problem. Clogged fuel filter: clogged fuel filters will limit the amount of fuel requires by the engine.

What are the symptoms of a vacuum leak?

Here are four signs that your vehicle has a vacuum leak.

Sporadic Idling. A vacuum leak introduces excess air into the engine, and this directly affects how your engine runs. …
Engine Hesitation. Your engine trouble will not be limited to your idling if you have a leak. …
Vacuum Sounds. …
4 Check Engine Warning.

What are the signs of a bad MAF sensor?

3 Signs of a Bad Mass Air Flow Sensor

Stalling, jerking, or hesitation during acceleration.
air fuel ratio is too rich.
air fuel ratio is too lean.

How do I reset my mass airflow sensor?

Check if the engine light is still on after the Mass Air Flow Sensor was replaced. The entire system can be reset by unhooking the battery and leaving it unhooked for 10 minutes. Keeping the battery unhooked for longer than 10 minutes won’t hurt anything.

How do I know if my mass air flow sensor is bad?

Symptoms of a Faulty Mass Air Flow Sensor

The engine is very hard to start or turn over.
The engine stalls shortly after starting.
The engine hesitates or drags while under load or idle.
Hesitation and jerking during acceleration.
The engine hiccups.
Excessively rich or lean idling.

Can a dirty air filter cause a lean code?

How do I fix the code P0171 on my Chevy?

What repairs can fix the P0171 code?

Replacing the fuel pump.
Replacing the fuel filter.
Replacing the fuel pressure regulator.
Replacing the powertrain control module.
Replacing one or more injectors.
Replacing one or more oxygen sensors.
Replacing the mass air flow sensor.
Repairing a vacuum leak.

Can bad spark plugs cause lean condition?

Can bad spark plugs cause a lean condition? No. Lean condition is more air than fuel. Misfire codes on multiple cylinders, banks, coil misfire codes (caused by plugs read as coils, catalytic convertor under efficiency threshold are common computer codes caused by old plugs.

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Can bad fuel injectors cause a P0171 code?

A P0171 code indicates the air-fuel ratio entering your engine block is not ideal. Two main issues typically cause this code. There is either too much air or not enough fuel in the lines to create the right ratio. … The second scenario might indicate a problem with your fuel pump or faulty fuel injectors.

Will a vacuum leak cause a lean condition?

A vacuum leak will cause the engine to run lean. In other words, there will be more air entering the engine than is needed to balance out the air/fuel ratio. … A rough running engine. Too fast of an idle.

Can a vacuum leak cause a car to run lean?

If your vehicle has an engine vacuum leak, the air-fuel ratio in your engine will be higher than 14.7:1, also called a “lean” mixture. This ratio means that there is too much air in your engine, and as a result, the engine will run poorly or not at all.

How much does it cost to replace the mass air flow sensor?

The Average Mass Air Flow Sensor Replacement Cost Ranges from $240 to $330 Depending on if You Go to the Mechanic or DIY. Cost to DIY: $3 to $240, depending on whether you clean the MAF first or replace it.

Can you clean mass air flow sensor?

We recommend that you clean the MAF sensor every time you change your air filter. … Spray 10 to 15 spurts of the mass air flower cleaner onto the wire or plate. Don’t scrub the parts; you may break the wire or damage the plate. Allow the MAF sensor to dry completely before reinstalling it in the air duct.