Fuel mixture
P1188 Fuel control (bank 1, sensor 1)
P1188 means: Fuel control (bank 1, sensor 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 most common repair costs about €60–120 in Estonia, depending on make and model.
Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Vacuum hose or actuator replacement€60–120parts and labour in Estonia, depending on make and model
What it means
The mixture has too little fuel or too much air, and the computer can no longer correct it on its own.
This is a make-specific code (BMW). The exact meaning can vary by model and year.
What you may notice
- Engine light on
- Rough idle
- Hesitation when accelerating
- The engine may stall
What could be wrong
- 1Air leak (vacuum hose, intake gasket, crankcase breather) · Vacuum hose or actuator replacement €60–120
- 2Dirty or faulty mass air flow sensor · MAF sensor replacement €120–240
- 3Weak fuel pump or clogged fuel filter · Fuel pump replacement €250–500
- 4Clogged injector · Injector replacement €200–400
- 5Exhaust leak before the oxygen sensor · Oxygen sensor replacement €90–180
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
- 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
Standard SAE description: Fuel Control (Bank 1 Sensor 1)