How to Disable Turn Signal Bulb-Out Warning on Škoda Rapid 2015 (NH) Iamcarhacker

By Juraj · Last updated August 15, 2026

This guide shows how to disable the bulb-out warning specifically for the turn signals on a Škoda Rapid (NH) 2015 after retrofitting LED bulbs. The procedure modifies a single bit in the Electronic Central Electric module (09) long coding, so diagnostics for tail lights, brake lights and fog lights remain fully active — only the turn-signal lamp check is switched off.

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Used tool in this guide

Mucar 892BT

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Video: How to disable turn signal bulb-out warning on Škoda Rapid 2015

This video shows how to disable the lamp diagnostics for turn signals on a Škoda Rapid (NH) 2015 using Mucar 892BT, by setting bit 4 of byte 19 in the central electrics module long coding.

Supported vehicles

Vehicle
rapid-nh

Technical overview

Vehicle	Škoda Rapid (NH)
Year	2015
System	09 – Electronic Central Electric (BCM)
Procedure type	Long coding
Difficulty	Easy
Time required	~5 minutes
Prerequisites	VAG tool with long coding access, 12 V battery in good condition, ignition ON

Step-by-step procedure

Connect the diagnostic interface

Plug the diagnostic interface into the OBD2 port. The port is located under the dashboard on the driver's side, just above the pedals.

Switch the ignition ON

The engine does not need to be running, but the battery should be in good condition to avoid voltage drops during coding.

Identify the vehicle

Open the OBDeleven app and let it identify the vehicle. Confirm the VIN matches your car (e.g. TMBEM6NH…).

Open 09 – Central Electrics

Open the control unit list and select 09 – Electronic Central Electric.

Open Long Coding

The app will read out the current coding string and present it as a list of bytes (SN 0, SN 1, … SN 22).

Locate byte SN 19

This byte controls the lamp diagnostics flags.

Tick bit 4

Tick the checkbox for bit 4 – Lamp Diagnostics For Turn Signals Inactive. Bits 0–3 (Fog, Tail, Brake, Turn signal PWM modes) should remain as they were. Do not touch bits 5 and 6 — those control fog and tail-light diagnostics, which you want to keep active so a real bulb failure on those circuits is still reported.

Apply the coding

Press OK to apply the new long coding. The app will write the value back to the module and confirm a successful response.

Cycle the ignition and test

Switch the ignition off, wait ~10 seconds, then switch on again. Activate the indicators on both sides and verify there is no "bulb out" message and the dash blinker rate is normal.

Check the other lamp diagnostics

Verify the other lamp diagnostics still work (e.g. pull a tail-light bulb briefly) — only the turn-signal warning should be suppressed.

💡Pro tip: Coding reference for byte SN 19:

bit 0 – Fog Lights And/Or Cornering Lights Via Pulse-Width Modulation (PWM) Active
bit 1 – Tail Lights Via Pulse-Width Modulation (PWM) Active
bit 2 – Brake Lights Via Pulse-Width Modulation (PWM) Active
bit 3 – Turn Signals Via Pulse-Width Modulation (PWM) Active
bit 4 – Lamp Diagnostics For Turn Signals Inactive ← set this to 1
bit 5 – Lamp Diagnostics For Fog Lights And/Or Cornering Lights Inactive
bit 6 – Lamp Diagnostics For Tail Lights Inactive

Additional information & compatibility notes

The Škoda Rapid NH platform (2012–2019) shares the central electrics architecture with several other VAG models of the same generation, so the same byte/bit logic typically applies — but the exact byte index can differ between BCM hardware revisions, so always read the current long coding first and verify the labels in your app before changing anything.

Alternative tools

Roundup5 Best OBD2 Scanners for VW/Audi/Skoda/Seat (Tested on Real VAG Cars)Read the guide

Legal & safety notice

This procedure modifies vehicle system settings through the control module. Incorrect use may cause faults or warning lights. Always ensure the vehicle is secured and follow proper safety procedures.