Fault code B1220 – a step-by-step guide to diagnosing and fixing it

The meaning of error code B1220 – Fuel Tank Pressure Sensor Circuit Open

B1220: Causes, signs and repairs

Error code B1220 is displayed and the check engine light is on - what does this mean?

The DTC B1220 is a body code that is recognized by OBD and EOBD systems and indicates a problem with the driver airbag circuit. This fault code affects the airbag system and can occur with different manufacturers, although the exact definition can vary depending on the vehicle brand.

What causes can this fault code have?

Defective driver airbag
Damaged airbag coil cable (slip ring)
Loose or corroded plug connections
Defective airbag control unit
Interrupted cable connections to the airbag
Resistance problems in the airbag circuit
Defective airbag sensors
Faulty ground connections

What symptoms occur in parallel with fault code B1220?

Airbag warning light: The airbag indicator light is permanently illuminated on the dashboard
Deactivated airbag: The airbag system may not be functional
Horn does not work: In the event of spiral cable defects, the steering wheel horn may also fail
Steering wheel buttons defective: Controls on the steering wheel no longer respond
Cracking noises: Noises when turning the steering wheel due to defective coiled cable

How can the problem with error code B1220 be rectified?

Repairing fault code B1220 requires a systematic diagnosis of the airbag system.
Replace the coiled cable: Replace the defective airbag coiled cable and calibrate it properly to the steering wheel position
Check and clean plug connections: Check all airbag connectors for corrosion and ensure tight fit
Replace airbag module: Replace the defective driver airbag according to manufacturer specifications and reprogram the system
Repair the airbag control unit: Have the defective control unit professionally repaired or replaced with a new one
Repair wiring harness: Fix any breaks or short circuits in the airbag wiring by having it professionally repaired
Check resistance values: Measure circuit resistances and replace defective components according to specifications

FAQ - Frequently asked questions about DTC B1220

Can I continue driving with fault code B1220?

Driving is technically possible, but not recommended. The airbag may not work with this trouble code, which represents a considerable safety risk. Have the problem rectified as soon as possible.

How much does it cost to repair fault code B1220?

The repair costs vary depending on the cause: spiral cable replacement 150-300€, airbag module 400-800€, control unit repair 200-500€. The diagnosis usually costs 80-120€.

Can I repair the code B1220 myself?

Airbag repairs require specialist knowledge and safety precautions. Work on the airbag system should only be carried out by qualified specialists, as there is a risk of injury.

How long does it take to repair the DTC B1220?

Depending on the cause, the repair will take 1-4 hours. Replacing the coiled cable takes about 2 hours, while replacing the airbag module can take up to 4 hours.

Does the error code B1220 return after the repair?

The fault code should not return if the repair has been carried out professionally and programmed correctly. It is important to calibrate the system correctly after installation.

Can code B1220 be caused by a weak battery?

Yes, a weak or faulty battery can cause voltage problems that lead to this EOBD code. Check the battery voltage first before carrying out expensive repairs.

Vehicles in which fault code B1220 occurs most frequently

Error code B1220 is a body code for airbag circuit problems and can occur in various vehicles, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Kuga (2008-2018)
Mercedes-Benz: C-Class, E-Class, A-Class, B-Class (2005-2015)
BMW: 3 Series, 5 Series, 1 Series, X3, X5 (2006-2016)
Volkswagen: Golf, Passat, Polo, Tiguan (2007-2017)
Audi: A3, A4, A6, Q5 (2008-2018)
Opel: Astra, Corsa, Insignia, Zafira (2009-2019)
Peugeot: 308, 508, 207, 3008 (2010-2020)
Renault: Megane, Clio, Scenic, Laguna (2008-2018)
If code B1220 occurs in your vehicle, you should have the airbag system checked immediately by a specialist workshop. The safety of the occupants is the top priority, and a defective airbag system can be life-threatening in an emergency. Do not hesitate to seek professional help, even if the repair costs may seem high at first.

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