Golf AVU Injector Fault P1226

Joined: 05/13/2008 Posts: 5 Karma: +0 / -0 Premium Support

Hello friends,
VAG Com is showing a fault code P 1226, which indicates a short circuit and misfire on one of the injectors in my Golf 4 1.6 AVU engine.
I replaced the nozzle, but the engine is still running on 3 cylinders.
The same mistakes.
Spark present, fuel present. Compression OK.
Help!!!!!!!!!!!!!!! Do you have any advice?

Translated on 06-07-2026, 19:53.

Which VAG-COM version are you using, and please provide the serial number.

Translated on 06-07-2026, 19:53.

Laie wrote:

Help!!!!!!!!!!!!!!!!! Do you have any advice?

Yes, don't use so many "!"s, one is enough.

It's highly likely, with a 98% probability, that the problem lies in the wiring harness if the nozzle is new.

Translated on 06-07-2026, 19:54.

Or something else...

Joined: 05/13/2008 Posts: 5 Karma: +0 / -0 Premium Support

Where can I find the SR? Sure, here is the translation of the text from German to English:

"Nr. ?"

"No. ?"

Translated on 06-07-2026, 19:55.

Laie wrote:

Where can I find the sr.? No. ?

Okay, that just got resolved.

On the "About..." screen. That's okay.

Yes, wiring would still be a good suggestion. Could you please post a copy of the error code data from the engine control unit (ECU address 01) here?

Best regards, Rainer.

Joined: 05/13/2008 Posts: 5 Karma: +0 / -0 Premium Support

After replacing the fuel injectors, the ELSA system indicates that the old learned values must be erased, and the engine control unit needs to be recalibrated. Is that correct? If so, how is it done with VCDS?

Translated on 06-07-2026, 19:56.

In the engine control unit, store the value 0 in adaptation channel 1.

I don't remember off the top of my head whether you need a login (access permission) for that. However, your error message is still strange. Could you please re-post the contents of the error log? Or, ideally, a complete scan so that the part numbers can be identified.

Best regards, Rainer.

Joined: 05/13/2008 Posts: 5 Karma: +0 / -0 Premium Support

The message from the engine control unit:

17634 Injector valve, cylinder 2 (N31), short circuit to ground, fault code P1226-35-00.

16686 Cylinder 2 misfire P0302-35-00

This message also appeared before the fuel injector was replaced.

Spark plugs replaced.

Translated on 06-07-2026, 19:58.

Just try swapping nozzles 2 and 3, and then clear the error memory. Make sure you haven't switched to the wrong one.

Best regards, Rainer.

Joined: 05/13/2008 Posts: 5 Karma: +0 / -0 Premium Support

If the first cylinder is located on the front side when looking at the timing belt, then I'm sure the second one is there too. Replaced the nozzle.
Pairing the device didn't have any effect either.

When I start the engine, the ESP light illuminates first. Then, when I press the accelerator, the exhaust warning light flashes briefly and then remains on continuously.