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Fuel mixture

P2177 Mixture too lean off idle (bank 1)

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P2177 means: Mixture too lean off idle (bank 1). The mixture has too little fuel or too much air, and the computer can no longer correct it on its own. Drive gently and have the car checked soon. The repair usually costs about €50–500 in Estonia.

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

The mixture has too little fuel or too much air, and the computer can no longer correct it on its own.

What you may notice

  • Engine light on
  • Rough idle
  • Hesitation when accelerating
  • The engine may stall

What could be wrong

  1. 1Air leak (vacuum hose, intake gasket, crankcase breather)
  2. 2Dirty or faulty mass air flow sensor
  3. 3Weak fuel pump or clogged fuel filter
  4. 4Clogged injector
  5. 5Exhaust leak before the oxygen sensor

Repair difficulty: Moderate

What you can check yourself

Listen at idle for a hiss. Check the vacuum hoses, especially old, cracked ones. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check the fuel trims on the diagnostic tool
  2. We do a smoke test to find the air leak
  3. We measure fuel pressure and check the MAF sensor
  4. We replace the leaking hose, gasket or faulty part

Standard SAE description: System Too Lean Off Idle Bank 1

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Car shaking or jerking · Rough idle or engine stalling

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 P2177 mean?

Mixture too lean off idle (bank 1). The mixture has too little fuel or too much air, and the computer can no longer correct it on its own.

Can I drive with code P2177?

Drive gently and have the car checked soon.

How much does it cost to fix P2177?

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

How is P2177 fixed?

We check the fuel trims on the diagnostic tool. We do a smoke test to find the air leak. We measure fuel pressure and check the MAF sensor. We replace the leaking hose, gasket or faulty part.

Related codes

P2179Mixture too lean off idle (bank 2)P2178Mixture too rich off idle (bank 1)P2176Throttle actuator: not learnedP2189Mixture too lean at idle (bank 2)P2190Mixture too rich at idle (bank 2)P2191Mixture too lean under higher load (bank 1)P0093Large leak in the fuel systemP0030Front oxygen sensor heater not working

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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