Secondary air pump (aka additional ventilation pump or air injection pump) is a critical element of the emission reduction system for ŠKODA Octavia TUR with gasoline engines 1.4 TSI, 1.8 TSI and 2.0 TSI. Its job is to force air into the exhaust manifold when the engine is cold, speeding up the warm-up of the catalytic converter and reducing emissions. CO/CH into the atmosphere. When this node fails, owners are faced with errors P0410 (“Secondary air system malfunction”) or P0420 (“Low catalyst efficiency”), as well as with power failures during acceleration and an increase in fuel consumption by 10-15%.

In this article we will look at how to independently diagnose a pump malfunction on Octavia A5/A7 (including restyled versions), what tools are needed for replacement, and why the original pump VW 06F 998 131 costs 3-4 times more than analogues from Bosch or Hella. We will also provide step-by-step instructions with photos, a spare parts compatibility table and answers to frequently asked questions - for example, is it possible to drive with a non-working pump and how to fool the ECU if replacement is delayed.

Signs of a faulty secondary air pump

The first signal about problems with the pump is Check Engine light comes on on the dashboard. However, there are also indirect symptoms that appear even before errors appear in the ECU memory:

  • 🔥 Engine stalls when cold (the first 1-3 minutes after startup), then the operation stabilizes. This is because the ECU shuts down the cylinders to protect the catalyst when there is no additional air available.
  • ⚡ Dips during acceleration at speeds of 1500-2500 rpm - the ECU limits the fuel supply due to a false signal about a “lean mixture”.
  • 💨 Noise from under the hood at startup: humming or whistling of the pump (if it is still working, but worn out) or complete silence (if the circuit is broken).
  • ⛽ Increased fuel consumption by 0.5-1.5 l/100 km - the ECU compensates for the “underblowing” of air by enriching the mixture.

On Octavia TUR with motors CBZB (1.4 TSI) and CDAB (1.8 TSI) a faulty pump often leads to code P0410, and on 2.0 TSI (CCZA) - to P0420 (due to stricter environmental standards Euro 5/6). Important: if the error appears only at temperatures below +5°C, it is not the pump that is at fault, but secondary air valve (06F 906 291) or its wiring.

⚠️ Attention: On Octavia RS with motor 2.0 TSI (300 hp) secondary air pump integrated into the system Valvelift. Its replacement requires adaptation through VCDS or ODIS - without this, the ECU will give an error P1423 ("Air flow mismatch").

Where is the pump located on the ŠKODA Octavia TUR?

On all versions Octavia A5 (2004-2013) and A7 (2013-2020) the secondary air pump is located on the right in the direction of travel, next to the washer reservoir and battery. The exact location depends on the engine type:

  • 🔧 1.4 TSI (CBZB, CAXA): the pump is attached to a bracket on the side member, under a plastic cover.
  • 🔧 1.8 TSI (CDAB, CDAA) and 2.0 TSI (CCZA, CCTA): the unit is shifted closer to the radiator, under the air duct.

To get to the pump you will need:

  1. Remove the plastic protection (4 clips).
  2. Disconnect the power connector (the lock goes up).
  3. Loosen the clamp of the hose going to the secondary air valve (7 mm wrench).

Photo of the pump location on the Octavia A7 1.8 TSI

On Octavia FL (2017+) the pump is hidden behind the washer reservoir. To remove it, first drain the liquid or move the tank to the side (it is secured with 2 bolts T25).

On models with DSG-7 access is complicated by the intercooler pipe - it will have to be temporarily dismantled (clamps 8 mm).

Diagnostics of the secondary air pump

Before replacing the pump, check its functionality. In 60% of cases the problem lies in wiring, fuse or valve, and not in the device itself. Here is a step-by-step diagnostic algorithm:

1. Check fuse F36 (10A) in the block under the steering wheel

2. Measure the voltage at the pump connector (should be 12V with the ignition on)

3. Test the pump winding with a multimeter (resistance 0.5-1.5 Ohm)

4. Check the tightness of the hoses (blow them with a pump)

-->

Voltage test: Connect a voltmeter to the contacts of the pump connector (pin 1 - “+”, pin 2 - “ground”). When the ignition is on, the voltage should be 11.5-12.5V. If there is no voltage, check the relay J329 (in the block under the hood) and wiring from the ECU (address 01 in VCDS).

Resistance test: Disconnect the connector and measure the resistance between the pump contacts. Standard for original pump VW — 0.8-1.2 Ohm. If the readings tend to infinity, the winding is broken; if it goes to zero, there is a short circuit.

Error code Probable Cause Remedy
P0410 Pump malfunction or open circuit Check voltage, replace pump
P0411 Incorrect air flow (clogged hose or valve) Cleaning the system, replacing the valve 06F 906 291
P0420 Low catalyst efficiency (secondary error due to pump) Catalyst diagnostics, pump replacement + reset adaptations
P1423 Flow mismatch (on motors with Valvelift) Adaptation through VCDS after replacement

💡

If the pump hums but does not pump air, try blowing it in the opposite direction (from the outlet fitting). Often the problem is solved by cleaning the impeller from oil deposits (especially on cars with mileage >150 thousand km).

Selection of spare parts: original vs analogues

Original pump from VW (06F 998 131 or 06F 998 131 A for restyled models) costs 18 000–25 000 ₽. However, there are proven analogues that are 2-3 times cheaper and have a comparable resource:

  • 🔹 Bosch 0 258 006 009 — the most reliable analogue (lifetime 150+ thousand km), price ~12 000 ₽.
  • 🔹 Hella 8EL 358 109-001 - good quality, but sensitive to moisture (~9 500 ₽).
  • 🔹 Febi Bilstein 22310 — budget option (~7 000 ₽), but are often counterfeited.
  • 🔹 Topran 111 578 — for temporary replacement (lifetime ~50 thousand km).

When choosing, pay attention to:

  1. Part number: for Octavia A7 Only pump with index is suitable A (for example, 06F 998 131 A).
  2. Connector polarity: on some analogs, the “+” and “-” contacts are swapped.
  3. Complete set: the original set includes a new gasket (06F 103 183) and clamps.

📊 Which secondary air pump would you prefer?
  • Original VW
  • Bosch
  • Hella
  • Febi Bilstein
  • Other brand

⚠️ Attention: On Octavia Scout and Octavia 4x4 a pump with a reinforced impeller is installed (06F 998 131 C). Installing a standard pump will lead to its rapid failure due to increased system resistance.

DIY secondary air pump replacement

To replace you will need:

  • 🔧 7 mm wrench (for clamps).
  • 🔧 Torx T25 (for mounting the washer reservoir on A7).
  • 🔧 Flat blade screwdriver (for connector retainers).
  • 🔧 Multimeter (for checking after installation).

Step by step instructions:

  1. Disconnect the negative terminal of the battery.
  2. Remove the plastic protection (on Octavia A5 — 4 clips, on A7 — 2 bolts T25).
  3. Disconnect the power connector by pressing the latch on top.
  4. Loosen the hose clamps (7 mm wrench) and remove them from the pump.
  5. Remove the 2 pump mounting bolts (10mm socket).
  6. Install the new pump in reverse order. Attention: The hose to the valve must go without kinks!
  7. Connect the battery and check the pump operation (should turn on for 30-90 seconds after starting the engine).

💡

After replacing the pump with Octavia RS or models with Valvelift be sure to adapt via VCDS (block 01 → “Adaptation” → channel 12). Without this, the ECU will generate an error P1423.

If after replacement there is an error P0410 left, check:

  • 🔌 Wiring integrity from the pump to the ECU (often grinds near the spar).
  • 🔧 Secondary air valve (06F 906 291) - it may jam in the closed position.
  • 📊 ECU firmware: on some versions Octavia A7 software update required 0655 or higher.

Is it possible to drive with a non-working pump?

Short answer: possible, but with reservations. Secondary air pump does not affect engine power after warming up (2-3 minutes after starting), however, its malfunction leads to:

  • 🌍 Increased environmental pollution (emissions CO exceed the norms Euro 5 2-3 times).
  • ⛽ Increased fuel consumption by 5-15% (the ECU enriches the mixture to protect the catalyst).
  • 🚗 Problems during technical inspection (the gas analyzer will show an excess of CH).

On Octavia TUR with motors 1.8 TSI and 2.0 TSI Driving for a long time with a faulty pump can lead to:

  • 🔥 Catalyst overheating (due to non-optimal mixture composition).
  • 💥 Diesel particulate filter clogged (on models with GPF).
  • 🚨 Emergency mode activation (rev limit to 3000 rpm) after 3-5 trips with error P0420.

How to deceive the ECU if the pump is broken and you need to drive urgently?

A temporary solution is to disconnect the pump connector and insert a resistor into it 1 ohm (power 5 W). The ECU will “see” the pump as working, but the error P0410 will return after 2-3 engine starts. This method is only suitable for Octavia A5 with ECU firmware up to 0550.

On Octavia A7 This trick won't work - the ECU checks the actual air flow through the oxygen sensor.

Frequently asked questions (FAQ)

🔧 Which secondary air pump is suitable for Octavia A7 1.4 TSI 2018?

For Octavia FL (2017-2020) with motor 1.4 TSI (CZDA) suitable pump 06F 998 131 A (original) or Bosch 0 258 006 009. Important: on restyled models the power connector has changed - it now has a latch instead of a latch.

⚡ Can the secondary air pump be repaired or is it just a replacement?

In 90% of cases, the pump is beyond repair (impeller wear, winding breakage). However, if the problem is pollution, it can be washed:

  1. Remove the pump and disassemble (be careful not to damage the O-ring).
  2. Clean the impeller and housing isopropyl alcohol or carburetor cleaner.
  3. Lubricate the bearing with silicone grease (eg Liqui Moly Silicon-Fett).

Such repairs will extend the life of the pump by 20-30 thousand km, but does not guarantee 100% performance.

💰 How much does it cost to replace a secondary air pump?

Cost of work in official services ŠKODA — 2 500–4 000 ₽. In unofficial car services the price is lower: 1 200–2 000 ₽. If adaptation is required via VCDS, add more 500–1 000 ₽.

🚗 Does the secondary air pump affect the dynamics of the Octavia RS?

On Octavia RS (2.0 TSI 300 hp) faulty pump does not affect maximum power, but can cause:

  • Delays during acceleration at rpm 1,500–2,500 rpm (The ECU limits the fuel supply).
  • Jerks when shifting gears (due to incorrect lambda probe readings).

After replacing the pump and adapting through ODIS the dynamics are completely restored.

🔍 How to check the secondary air valve?

Valve (06F 906 291) is checked like this:

  1. Remove the valve (located on the exhaust manifold).
  2. Blow into it with your mouth: when closed (without power), no air should pass through.
  3. Apply to the connector 12V — the valve should open with a click.

If the valve does not open, replace it. Original cost - 3 500 ₽, analogue Febi — 1 800 ₽.