Hood opening sensor ŠKODA Octavia A7: how it works, where it is located and how to replace it

Hood opening sensor ŠKODA Octavia A7 - a small but critical element of the safety and comfort system. It is responsible for turning on the lighting in the engine compartment, signaling that the hood is open on the dashboard, and in some trim levels, for blocking the starter when the hood is open. Despite the simplicity of the design, this sensor often becomes a source of headaches for owners: false alarms, a constant light on the indicator on the dashboard, or a complete lack of response to opening the hood.

In this article we will analyze all aspects of sensor operation on Octavia A7 (including restyled versions 2017–2020): where it is located, how it is designed, what symptoms indicate its malfunction, and how to diagnose and replace it yourself. We will pay special attention a typical mistake made by technicians who confuse the hood sensor with the trunk switch due to the identical design of the connectors. We will also provide current article numbers of original and analog sensors with prices for 2026.

Where is the hood opening sensor located on the Octavia A7

B ŠKODA Octavia A7 (2013–2020) the hood opening sensor is located in upper-right corner of the hood, next to the hood lock. It is integrated into the plastic housing of the fixation mechanism and is a micro-switch (tip) with a spring-loaded rod. When closing the hood, the rod is drowned, breaking the contacts - when opened, it returns to its original position, closing the chain.

The exact location depends on the year of manufacture and configuration:

• 🔧 pre-facelift (2013–2016): the sensor is built into the plastic bracket of the hood lock, is attached with two latches. Black connector with a lock.
• 🔧 Restyle (2017–2020): the sensor is moved 2-3 cm closer to the radiator, the gray connector. Some versions use a contactless (induction) sensor.
• 🔧 RS versions: the sensor can be duplicated by an additional terminal for the system Start-Stop (located next to the main one).

To access the sensor, it is enough to open the hood and remove the plastic protection of the lock (it is mounted on 3 clips). Don't confuse it with the trunk end. They have the same connectors, but different length of the rod and resistance of contacts.

Signs of a bad hood sensor

The faulty hood opening sensor manifests itself in different ways, but there is 5 Key Symptomsthat should alert you:

1. The open hood indicator is constantly on. on the dashboard, even when the hood is closed. Often accompanied by an audible signal when the ignition is turned on.
2. The lighting lamp under the hood is not turned on When the hood is opened (or, conversely, it burns constantly).
3. Error in on-board computer: codes B105D00 (failure of the hood sensor circuit) or U111300 (loss of communication with the body module).
4. The car won't start (in versions with Start-Stop): the system blocks the starter, "thinking" that the hood is open.
5. False alarms (If the sensor is connected to the security system)

Important: similar symptoms can cause wiring problems (break, short circuit) or connector. Before replacing the sensor, be sure to check the circuit with a multimeter.

How to check the hood opening sensor with a multimeter

Diagnostics of the sensor takes no more than 10 minutes and requires a minimal set of tools: a multimeter (in continuity or resistance measurement mode) and a screwdriver. Follow the step by step instructions:

Turn off the battery's negative terminal |Remove the plastic hood lock protection |Deactivate the sensor connector (press the lock) |Put the multimeter into vertebrae mode |Check the sensor circuit in closed/open state-->

Procedure:

1. Open the hood and disconnect the connector from the sensor (click on the plastic locker on the side).
2. Connect the multimeter probes to the connector contacts (polarity is not important).
3. Close the hood. (or press the sensor stem with a screwdriver): with a serviceable sensor, the circuit should open (resistance → ∞).
4. Open the hood: the chain must lock up (Resistance → 0 Ohms).
5. If the readings do not change or "float", the sensor is faulty.

Additionally check wiring:

• 🔌 Short circuitBetween the connector contacts (when the sensor is turned off), the resistance must be infinite.
• 🔌 Break: between the connector contact and the "mass" (body) resistance should be in the range of 0.5-1.5 ohms (check each wire separately).

What if the multimeter shows a “1” (break) in both positions?

This means that either the sensor is completely out of order (a break in the internal circuit) or the contacts in the connector have oxidized. Try to clean the contacts with alcohol or a special liquid for electronics (for example, Kontakt 60). If the problem persists, the sensor must be replaced.

Articles and prices of hood sensors for Octavia A7

On ŠKODA Octavia A7 The hood opening sensors were installed from VW Group with different articles depending on the year of production and body type (liftback / wagon). Below is a table with original and analog parts, current for 2026.

Article	Manufacturer	Sensor type	Applicability	Price, rubles
5Q0 905 911	VW/SKODA (OEM)	Mechanical (end)	2013–2016 (pre-restyle)	1 200–1 500
5Q0 905 911 A	VW/SKODA (OEM)	Mechanical (improved version)	2017–2020 (restyle)	1 400–1 800
5Q0 905 911 C	VW/SKODA (OEM)	Contactless (induction)	2018–2020 (RS, top-end configurations)	2 500–3 000
273 005 010	Hella	Mechanical (analogue)	All versions	800–1 100
SW20186	Febi Bilstein	Mechanical (analogue)	2013–2020	700–900

⚠️ Attention: When buying an analogue, pay attention to rod length - it must match the original. Sensors for Octavia A5 or VW Golf 6 They look similar, but have a different height of operation and will not fit.

Where to buy:

• 🛒 Official ŠKODA dealers12 months warranty, but prices are 20-30% higher.
• 🛒 Online stores (Exist.ru, Autodoc, Kolesa-darom.ru: There are often discounts, but check the reviews about the seller.
• 🛒 Showdown: used sensor will cost 300-500 rubles, but the risk of buying a faulty part is high.

Replacing the hood opening sensor: step-by-step instructions

Replace the hood sensor with Octavia A7 You can do it yourself in 15-20 minutes. You will need:

• 🔧 Flathead screwdriver (for removing clips).
• 🔧 10 mm socket wrench (for some versions).
• 🔧 New sensor (check the article!).
• 🔧 Silicone grease (eg Liqui Moly Silicon-Fett).

Step by step process:

1. Disconnect the battery (remove the negative terminal) to avoid short circuit.
2. Remove plastic protection hood lock: put it with a screwdriver on both sides and pull up (clips are triggered with a characteristic click).
3. Disconnect the connector from the sensor by pressing the latch.
4. Remove the old sensor:
   • On the pre-facelift: turn it counterclockwise and pull it out.
   • On restyle: Turn 1 bolt with the end key by 10 mm.

Install a new sensor in reverse order. Don't tighten the bolt too much. - this can deform the body.

Apply silicone lubricant on the sensor rod for protection from moisture and corrosion.

Connect the connector and check the work: close/open the hood several times, making sure that the indicator on the instrumentation goes out.

⚠️ Attention: after replacing the sensor it may be necessary error reset in the body control unit (BCM). To do this:

1. Connect a diagnostic scanner (for example, VCDS or OBDeleven).
2. Go to block 09 – Cent. Elect..
3. Select Clearing DTC Memory.

Typical replacement mistakes and how to avoid them

Even experienced car owners make mistakes when working with the hood sensor. Here. TOP-5 misses and how to prevent them:

1. Confusion with the trunk end. The sensors are visually identical, but have different resistances. Check the articulum on the body. before installation.
2. Incorrect stem installation. If the rod is drowned too deep, the hood will not be fixed. Adjust the position of the sensor so that the rod protruded 3-4 mm with the open capote.
3. Ignoring contact oxidation. Even the new sensor will not work properly if the connector is covered with oxide. Clean your contacts special liquid (for example, CRC Contact Cleaner).
4. Lack of lubrication. Without silicone lubrication, the sensor rod corrodes quickly, especially in winter. Apply lubricant The rod and the sealing ring.
5. Poor polarity. Although the sensor is not polarized, when connecting the connector, it is important not to confuse the contacts. Compare the location of the wires. with an old sensor.

If the problem persists after replacement, the causes may be deeper:

• 🔋 Failure of the body control unit (BCM) - requires diagnostics with a scanner.
• 🔌 Broken wiring in the corrugated between the hood and the body (check the multimeter).
• 🚨 Firmware failure BCM - is solved by reflashing at the official dealer.

Frequently asked questions (FAQ)

Can I drive with a faulty hood sensor?

Technically yes, but it's not safe. Firstly, There will be no lighting under the hood.This will make it harder to inspect the engine in the dark. Secondly, The alarm may be falsely triggered. Thirdly, in the versions of Start-Stop the system can block offIf you think the hood is open. We recommend replacing the sensor as soon as possible.

How to Reset a Cabin Sensor Error Without a Scanner?

On Octavia A7 Reset the error of the hood sensor without diagnostic equipment can be in two ways:

1. Battery disconnectionRemove the negative terminal for 10-15 minutes. It'll throw off errors in memory. BCMbut does not guarantee the elimination of the cause.
2. Manual reset via dashboard:
   • Turn on the ignition (without starting the engine).
   • Press and hold the button SET/RESET on the steering column switch for 10 seconds.
   • The error should disappear from the display.

If the error appears again, the problem is not in the sensor, but in the wiring or control unit.

Will the sensor from the VW Golf 7 fit the Octavia A7?

Partially. Sensors from VW Golf 7 (article 5Q0 905 911) identical in design but may differ stem-length and connector. Before buying, compare:

• 🔹 pre-facelift Octavia A7 (2013–2016): suitable sensor from Golf 7 until 2016.
• 🔹 Facelift Octavia A7 (2017–2020): need a sensor from Golf 7 2017+ or Tiguan 2.

It is best to compare the articles by VIN code on the website ETKA or Elcats.

What if the sensor works, but the lamp under the hood does not burn?

The problem is not in the sensor, but in lamp-chain Or the lamp itself. Check it out.

1. Under-hood lighting lampRemove it (turn counterclockwise) and check the filament.
2. fuse: on Octavia A7 The lighting is controlled by the safety lock. F37 (10A) in the block SCB (under the steering wheel).
3. Relay: relay J329 (in the same unit) controls the lamp circuit.

If the lamp and safety lock are in good condition, check. wiring from sensor to block BCM (contact T32/14).

Can I turn off the hood sensor altogether?

Technically yes, but this not recommended for several reasons:

• 🚫 The under-hood lights will be turned off. It is not easy to repair in the dark.
• 🚫 The alarm will stop responding to open the hood (if the sensor is connected to the guard).
• 🚫 There may be errors. in the block BCMIt affects the operation of other systems.

If the sensor interferes (for example, due to false positives), it is better to replace it with a serviceable or comb through BCMTurning off the hood check in the settings.