Thresholds on the ŠKODA Octavia A5: how to choose, replace and protect against rust

ŠKODA Octavia A5 (2004-2013) is one of the most popular models of the Czech brand, but even it is not immune to corrosion of the thresholds. Owners often encounter rust on these elements after 5-7 years of operation, especially in regions with aggressive winters. In this article, we will discuss which thresholds are set for Octavia A5How to choose, replace and protect them from destruction.

Thresholds are not only an aesthetic element, but also a part of the load-bearing structure of the body. Damage to them can lead to reduced vehicle stiffness and even safety issues. We have collected all the relevant information: from the original parts to the step-by-step instructions for replacing with photos and videos. And also, checklistwhich are not inferior in quality to factory, but are cheaper.

Original thresholds for ŠKODA Octavia A5: articles and features

On Octavia A5 (including the 2009 facelift) two types of thresholds were set: front and rear, and also amplifiers (internal elements). Original parts are manufactured under the brand ŠKODA or VW GroupBut their price often bites - from 8 000 to 15,000 rubles for one side. Below is a table with relevant articles:

Threshold type	Article (left/right)	Applicability	Approximate price, rubles
Front threshold (outer)	1Z6 807 101 A / 1Z6 807 102 A	Sedan, wagon (before facelift)	12 000–14 000
Back threshold (outer)	1Z6 807 103 A / 1Z6 807 104 A	Sedan, wagon (before facelift)	10 000–12 000
Threshold amplifier (internal)	1Z6 807 501 / 1Z6 807 502	All modifications	4 000–6 000
Threshold facelift (2009+)	1Z6 807 101 B / 1Z6 807 102 B	Sedan, station wagon (after facelift)	13 000–15 000

Important! When ordering the original thresholds, specify VIN code car - on restyled models (2009-2013) the shape of the fasteners has been changed. Also note the configuration: on versions with xenon headlights or Elegance package. There may be different wiring holes.

If the original is too expensive, consider it. high-quality analogues. Among the trusted manufacturers:

• 🔹 Febi Bilstein German quality, the items match the original, but the price is lower by 30-40%.
• 🔹 Polcar Polish brand, good price/quality ratio (from 5 000 rubles per side).
• 🔹 AMC Taiwanese-production, budget option (from 3,500 rubles), but requires revision on trifles.
• 🔹 Valeo French manufacturer, often delivers parts to the conveyor VW Group.

⚠️ Attention! When purchasing analogues, be sure to check metal thickness - cheap Chinese rapids it can be 0.6-0.8 mm instead of the standard 1.2 mm. It's critical for body stiffness!

Causes of threshold corrosion on Octavia A5: who is to blame and what to do

Thresholds Octavia A5 It rots for several reasons, and not all of them are related to the age of the car. Main factors:

1. Poor factory corrosion treatment. On many copies before 2008, the anticor was applied point-by-point, rather than a solid layer.
2. Chipped and microcracked. Stones from under the wheels damage the paintwork, opening the access to moisture.
3. Drainage holes. If they are clogged with dirt, water accumulates inside the threshold and accelerates rusting.
4. Electrochemical corrosion. Occurs due to contact of different metals (for example, steel threshold + aluminum bumper).

The most vulnerable areas are the junctions of the threshold with the arch and front pillar, as well as the lower edge, where road chemistry accumulates. If you do not eliminate the problem at an early stage, the rust will eat through the metal, and you will have to cook patches or change the threshold entirely.

How do you know if the thresholds are already time to be treated?

• 🔍 Bloating paint or bubbles under the LCP.
• 🔍 Red slacks on the lower edge of the threshold.
• 🔍 Crunch or creak when pressed on the threshold with your hand (a sign of internal corrosion).
• 🔍 Visible holes or metal stratification (critical stage).

Step-by-step instructions: how to replace the threshold on a ŠKODA Octavia A5 with your own hands

Replacing the threshold is a time-consuming process, but with the presence of a welding machine and patience, you can cope independently. Below is a step-by-step algorithm for front-left (For the right-wing, it is symmetrical).

Required tools:

• 🔧 Grinder with cutting wheel (125 mm).
• 🔧 Welding semi-automatic (wire 0.8 mm).
• 🔧 A drill with a set of drills (for drilling points).
• 🔧 A set of screwdrivers and heads (Torx T25, T30).
• 🔧 Putty, primer, paint (to match the body color).

Step 1. Dismantling the old threshold

1. Remove the front door (unscrew the hinges and disconnect the wiring).
2. Remove the plastic sill trim (it is attached with clips).
3. Drill out the factory spot welds around the perimeter of the threshold.
4. Using a grinder, carefully cut off the old threshold, leaving 1–2 cm of metal for welding the new one.

Make sure the battery is disconnected|Protect the windows and interior from sparks|Check for a fire extinguisher nearby|Wear a welding helmet and gloves-->

Step 2. Fitting and welding the new threshold

1. Try on the new threshold and adjust it with a grinder if necessary.
2. Tack it at 3-4 points, then weld it with a continuous seam (step 2-3 cm).
3. Sand the seams with a sander and remove scale.
4. Apply anti-corrosion primer (eg Body 950).

Step 3: Finishing

1. Fill up any uneven areas and sand with sandpaper. P80–P120.
2. Paint the sill to match the body color (use the paint code from the plate on the pillar).
3. Install the plastic trim and door.

⚠️ Attention! If the threshold is rusted through, before welding necessarily clean the internal cavity from dirt and treat it Movilem or Dinitrol ML. Otherwise, the new part will quickly rust from the inside!

Anti-corrosion treatment of thresholds: how and how to protect metal

Even new thresholds need additional protection. On Octavia A5 Three methods are effective:

1. Liquid anticorrosion agents (for hidden cavities)

Used for processing inner surface threshold. Best compositions:

• 🧪 Dinitrol ML — forms an elastic film and does not crack during vibrations.
• 🧪 Mobil 1 Rust Protection — penetrates well into microcracks.
• 🧪 Noxudol 700 — Swedish anticorrosive, lasts up to 5 years.

Application technology: drill a hole 8–10 mm at the bottom of the threshold, insert the spray tube and fill the composition until excess appears.

2. Mastics and bitumen coatings (for external protection)

Applied to bottom and side surfaces threshold. Recommended products:

• 🛡️ Body 930 — anti-gravel mastic, withstands impacts from stones.
• 🛡️ Tectyl Bodysafe - does not dry out, retains elasticity.
• 🛡️ Liqui Moly Unterbodenschutz - Contains zinc for added protection.

3. Pasting with protective film

For additional protection against chipping, use transparent anti-gravel film (for example, 3M Scotchgard). It adheres to the painted surface and prevents damage to the paintwork.

How to check the quality of anticorrosive?

After treatment, leave the car for 24 hours, then check the sills for:

- Smudges (means the anticorrosive agent is too liquid).

- Bubbles (poor adhesion).

- Unpainted (need to repeat treatment).

Threshold repair without replacement: when possible

If corrosion has not eaten through the metal, the threshold can be repair without a complete replacement. Recovery methods:

1. Local welding of patches

Suitable for holes up to 5 cm in diameter. Algorithm:

1. Cut out the rusty area with a grinder.
2. Choose a thick metal patch 1.0–1.2 mm.
3. Weld it overlapping (2–3 cm) and putty.

2. Using fiberglass and epoxy resin

Method for small corrosion areas:

1. Strip away the rust to bare metal.
2. Glue glass cloth impregnated with epoxy resin (for example, Poxipol).
3. Once dry, sand and paint.

When repairs are futile:

• ❌ Rust has covered more than 30% of the threshold area.
• ❌ The metal crumbles when pressed.
• ❌ Through holes appeared near the pillars (critical for body rigidity).

Cost of work: how much does it cost to replace thresholds in the service

Threshold replacement price Octavia A5 depends on the scope of work and region. Below are the average prices in Russia (for 2026):

Type of work	Cost (for 1 side), rubles	Notes
Replacing the outer threshold (without painting)	8 000–12 000	Includes welding and anti-corrosion
Replacing a threshold with an amplifier	12 000–18 000	Interior disassembly required
Painting the threshold	3 000–5 000	Includes primer and varnish
Anti-corrosion treatment (complex)	2 500–4 000	Includes Movil and mastic

You can save money if:

• 💰 Buy the thresholds yourself (services often charge a 20–30% markup).
• 💰 Perform anti-corrosion treatment yourself.
• 💰 Replace thresholds in pairs (many services give a discount).

Where to order work? Look for services with equipment for spot welding - this guarantees factory quality seams. Avoid garage workshops where they cook in bulk - this weakens the body.

Common mistakes when replacing thresholds and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to repeated corrosion. Let's look at the most common ones:

1. Ignores internal processing.

   Many people cook a new threshold, but forget to treat it from the inside. After 1-2 years it rusts again.

   Solution: Drill technological holes and fill in anticorrosive (Dinitrol 4010).

2. Saving on primer.

   Cheap primers do not protect against moisture, and the paint peels off quickly.

   Solution: Use epoxy primer (for example, PPG DP40).

3. Incorrect fit.

   If the threshold does not fit well, over time a gap will appear where water will flow.

   Solution: Check clearances up to welding using a probe.

⚠️ Attention! Never weld thresholds on a car with connected battery - this can damage the electronic components! Disconnect the negative terminal and use mass on the body.

FAQ: Answers to frequently asked questions about ŠKODA Octavia A5 door sills

Is it possible to drive with a rusted sill?

Short term - yes, but it is dangerous. The threshold is part body power structure, and its destruction reduces rigidity by 15–20%. In the event of an accident, this can lead to deformation of the interior. If the rust is through, replace the threshold as soon as possible.

Which anticorrosive agent is better for thresholds: Movil or Dinitrol?

Depends on the task:

• Movil cheaper (from 300 rubles / liter) and suitable for prevention.
• Dinitrol ML more expensive (from 800 rubles/liter), but lasts longer and does not dry out.

Better for hidden cavities Dinitrol, for external processing - Movil with rust converter.

How long does it take to replace a threshold in the service?

On average 6–8 hours per side, if required:

• Welding.
• Anti-corrosion treatment.
• Painting.

Without painting - 3–4 hours. Check the timing in advance, as some services only provide the car the next day (due to paint drying).

Is it possible to paint the sills without removing the doors?

Technically yes, but the quality will be worse. When painting without removing the doors:

• It is difficult to apply primer evenly in joints.
• There is a high risk of paint getting on the seals.
• It will not be possible to properly process the inside of the threshold.

For long-lasting results, it is better to remove the doors.

Which thresholds are better: original or analogues?

Original thresholds (ŠKODA/VW) are guaranteed to fit the size and thickness of the metal, but their price is too high. Analogues (Febi, Polcar) is 30–50% cheaper, but:

• May require some work around the edges.
• Sometimes thinner than the original (check with a thickness gauge!).
• They do not always fit perfectly with the arches.

The best option is Febi Bilstein (articles coincide with the original ones).