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Fuel mixture

P0171 Mixture too lean

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P0171 means: Mixture too lean. Too little fuel or too much air is getting into the engine. Drive gently and have the car checked soon. The repair usually costs about €50–500 in Estonia. The most common cause: air leak: a hose, intake gasket or crankcase breather.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Typical repair cost€50–500parts and labour in Estonia

What it means

Too little fuel or too much air is getting into the engine. The engine computer has already added as much fuel as it is allowed to.

What could be wrong

  1. 1Air leak: a hose, intake gasket or crankcase breather
  2. 2Mass air flow sensor reads less air than is actually going in
  3. 3Weak fuel pump or clogged fuel filter
  4. 4Clogged injector

What you can check yourself

Listen at idle for a hissing sound. Check the hoses after the air filter. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We smoke-test the intake
  2. We check fuel pressure and the mass air flow sensor
  3. We replace the leaking hose, gasket or sensor

Standard SAE description: System Too Lean (Bank 1)

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong and what the repair costs before we start any work.

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Questions

What does fault code P0171 mean?

Mixture too lean. Too little fuel or too much air is getting into the engine. The engine computer has already added as much fuel as it is allowed to.

Can I drive with code P0171?

Drive gently and have the car checked soon.

How much does it cost to fix P0171?

Roughly €50–500 in Estonia. The price depends on exactly what has failed and on the car.

How is P0171 fixed?

We smoke-test the intake. We check fuel pressure and the mass air flow sensor. We replace the leaking hose, gasket or sensor.

Related codes

P0172Mixture too richP0174Mixture too lean (bank 2)P0175Mixture too rich (bank 2)P2096Mixture too lean after the catalytic converterP2097Mixture too rich after the catalytic converterP2187Mixture too lean at idle

This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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