Workshop · diagnostics and repairsWe reply the same day
Diagno.ee
Fuel mixture

P0174 Mixture too lean (bank 2)

By: · Updated:

P0174 means: Mixture too lean (bank 2). 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. V engines have two banks of cylinders; this code refers to the second bank. If P0171 is also present, the cause is probably shared, for example an air leak.

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 2)

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.

Book a diagnostic check

Questions

What does fault code P0174 mean?

Mixture too lean (bank 2). 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. V engines have two banks of cylinders; this code refers to the second bank. If P0171 is also present, the cause is probably shared, for example an air leak.

Can I drive with code P0174?

Drive gently and have the car checked soon.

How much does it cost to fix P0174?

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

How is P0174 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

P0171Mixture too leanP0172Mixture too richP0175Mixture too rich (bank 2)P2096Mixture too lean after the catalytic converterP2097Mixture too rich after the catalytic converterP2187Mixture too lean at idle

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.

Book a diagnostic check