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Fuel mixture

P0172 Mixture too rich

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P0172 means: Mixture too rich. Too much fuel is going into the engine. Drive gently and have the car checked soon. The repair usually costs about €50–500 in Estonia. The most common cause: leaking injector. Other possible causes: fuel pressure too high, mass air flow sensor reads wrong.

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 much fuel is going into the engine. Fuel consumption goes up and the catalytic converter can be damaged.

What could be wrong

  1. 1Leaking injector
  2. 2Fuel pressure too high
  3. 3Mass air flow sensor reads wrong
  4. 4Clogged air filter
  5. 5Faulty oxygen sensor

What you can check yourself

Check that the air filter is clean. A fuel smell or black smoke points to a leaking injector. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check fuel trims with a diagnostic tool
  2. We check the injectors and fuel pressure
  3. We replace the air filter, sensor or injector

Standard SAE description: System Too Rich (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. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code P0172 mean?

Mixture too rich. Too much fuel is going into the engine. Fuel consumption goes up and the catalytic converter can be damaged.

Can I drive with code P0172?

Drive gently and have the car checked soon.

How much does it cost to fix P0172?

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

How is P0172 fixed?

We check fuel trims with a diagnostic tool. We check the injectors and fuel pressure. We replace the air filter, sensor or injector.

Related codes

P0171Mixture too leanP0174Mixture 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 idleP0170Fuel trim: circuit fault (bank 1)P0173Fuel trim: circuit fault (bank 2)

Based on AI combined with our hands-on workshop experience and knowledge. 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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