01218 is the airbag controller reporting a problem on the firing circuit for the front passenger side airbag. Ross-Tech lists the code as Side Airbag Igniter, Front Passenger Side (N200), with faulty wiring and connectors to N200 and a faulty igniter given as the two causes. On the cars where this shows up most, the wiring under the passenger seat is the failure.
N200 is Volkswagen Group's component number for the igniter in the front passenger side airbag, built into the outboard side of the seat back. The airbag controller measures the resistance of that firing circuit with the key on. When the reading falls outside its window, or when the circuit reads shorted, the code stores and the airbag warning lamp comes on.
Scan tools break 01218 down further, and the sub fault directs the work. Resistance too high points at a poor connection or a partial break, resistance too low at the igniter or a partial short, short to positive and short to ground at damaged insulation, and open circuit at a disconnected or broken line. Write the sub fault down before anything gets cleared.
There is a warning attached to this code that matters more than the diagnosis. Ross-Tech states that when the fault reads short to positive or short to ground, the DTC should not be cleared, because clearing it can cause the airbag to deploy. Read the code, leave it stored, and repair the circuit first.
Circuit. The controller is measuring a firing loop right now and telling you the number is wrong. Nothing in 01218 is a record of a collision, and it stores on cars that have never been hit.
The exception is the one every squib code shares. A side airbag that has fired no longer completes its circuit, so a car struck on the passenger side reads 01218 alongside the crash records the controller stores under its own numbers, 00595 for the general memory and 01227 for the passenger side. Those are two separate problems on the same repair order.
Not on its own. A reset addresses a controller holding locked crash data, and it does nothing about a broken wire under a seat, so the code returns immediately.
Ross-Tech's entry for this code points North American 2005 through 2007 Jetta, Rabbit, Eos, and Passat owners to Volkswagen bulletin 69-08-02, reference 2011271. Shops working those cars have long dealt with the connector under the passenger seat, cleaning it up or repairing the harness through it. If the airbag itself deployed, the seat side airbag has to be replaced and the controller then needs an airbag module reset to clear its stored record.
01218 is a VAG numbered fault, so it reads the same on Volkswagen, Audi, Seat, and Skoda vehicles with front seat side airbags. The code sits in a block with its neighbors: 01217 is the driver side front igniter N199, 01219 and 01220 are the rear side igniters N201 and N202, and 01588 and 01589 are the head curtain igniters N251 and N252. These are five digit VAG numbers rather than SAE B codes, so a generic tool may report the same failure under a different number.
Note the sub fault, then leave the code alone until the repair is finished. Disconnect the battery, wait out the discharge period, and move the passenger seat to reach the connector underneath. Look for debris in the housing, corroded or spread pins, and a loom rubbing against the seat frame.
If the seat side airbag is the failed part, the replacement has to match the vehicle, since resistance and connector type both vary. Genuine OEM seat side airbags are searchable by vehicle, anything not listed can go through a part request, and belts that locked in a side impact go through seat belt repair.
Related codes: 01217, 01219, 01227, 00595
Keep reading:
Code scope: Audi, Volkswagen. The same number can mean something different on another manufacturer, so match the code to your make before you act on it.
A reset clears stored crash data. A replacement part fixes a hardware fault. We have read these codes since the nineties and will tell you which one you are looking at.
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