How do I fix my Subaru P0171?

How do I fix my Subaru P0171?

|Tech Notes. If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

Why is my Subaru running 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.

Can a bad spark plug 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. Bad spark plugs could actually cause the opposite code ( too rich, bank 1).

How do I reset my P0171 code?

Fixing a Check Engine Light (P0171)

1. Step 1: Purchase a OBD 2 Bluetooth Scanner.
2. Step 2: Insert the Scanner Into the OBD 2 Port of Your Car.
3. Step 3: Run a Diagnostic Scan.
4. Step 4: P0171.
5. Step 5: Removing the Mass Air Flow Sensor.
6. Step 6: The MAF Sensor.
7. Step 7: Clean the Sensor.
8. Step 8: Clear the Code.

How do I fix P0171 System Too Lean Bank 1?

What repairs can fix the P0171 code?

1. Replacing the fuel pump.
2. Replacing the fuel filter.
3. Replacing the fuel pressure regulator.
4. Replacing the powertrain control module.
5. Replacing one or more injectors.
6. Replacing one or more oxygen sensors.
7. Replacing the mass air flow sensor.
8. Repairing a vacuum leak.

How long can you drive with P0171?

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.

Can a bad O2 sensor cause P0171?

Additional Causes of Code P0171 A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers.

How much does it cost to fix P0171 code?

Perhaps your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code is appearing because it is due to you needing to replace your fuel injector/injectors. Generally, a fuel injector replacement cost will between $800 and $1,450 for a full replacement.

What causes the p0171 code on a Subaru Impreza?

There are many things that can cause the P0171 trouble code on the Subaru Impreza. Here are the most common ones. Vacuum Leaks – With the Subaru Impreza, one of the most common cause for the P0171 code to show is a vacuum leak. Take a look around and see if you can find the vacuum leak.

What is the trouble code on a Subaru Impreza?

One of the most common trouble codes with the Subaru Impreza is the P0171 code. This code number references a number that is given to you when you plug your car into a OBDII scanner. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common. P0171 is an OBDII trouble code.

Why is my p0171 system Lean code not working?

Change the plugs and oil about a month and a half ago and got a maf sensor error and get a P0171 system lean code after resetting the ECU. I’ve been troubleshooting since then but can’t seem to get the P0171 ironed out. The cel only pops at idle and the car runs great through the power band. Here’s what I’ve already done.

What to do if you get your p0171 again?

Swap MAF’s with a local (and friendly) WRX buddy, reset your ECU and drive for a day or two. If you get your P0171 again, the MAF was not it. If you go CEL free, and even better, if the OTHER person gets a P0171, then you found your culprit. Either clean the old MAF or shell out the cash for a new one.