Volkswagen/Audi 1.8 T 20v turbo (EA113)Ignition coils and spark plugs
Ignition coil failure on the 1.8 T 20v
Why this rating?
Low severity: A nuisance or wear. It does not immobilise the car or damage other parts.
Frequency common: A German used-car specialist states that "the 1.8T often has problems with the ignition coils (from 2001 to 2003)" and recommends looking for later units, in which most of those early problems had already been corrected. Owner reports confirm it across several models and power outputs: on the Golf IV (one coil replaced as a precaution at 130,000 km), on the Passat (two replacements on the same car, at 70,000 and 183,000 km), on the Audi A3 (on both the 150 hp and the 180 hp engines) and on the Audi TT (on both the 180 hp and the 225 hp).[1][2][3][4][5]
Symptoms
- The engine warning light comes on, sometimes intermittently, when a coil starts to fail.[2]Engine warning light: other faults that cause it · Garage soon
- The engine jerks in fits or loses power on the cylinder whose coil is failing, especially when cold or at high revs.[3]Jerking: other faults that cause it · Garage soon
Why it happens
Each cylinder has its own coil, mounted directly on the spark plug; with the heat of the engine bay and the passing of the years, the internal insulation degrades and the coil stops producing the spark with the required intensity, especially on units built between 2001 and 2003.[1]
If it is not repaired: Owner reports document repeated coil replacements on the same car over the years (the Passat case, at 70,000 and again at 183,000 km), which suggests the fault can recur on another cylinder later; we have not found cases of major damage to the engine or catalytic converter from this cause in the sources consulted.[3]
Affected cars and years
Documented on all three power outputs of the engine (150, 180 and 225 hp) and on models from several Group brands; the German specialist consulted places the bulk of cases on units built between 2001 and 2003.[1][4][5]
| Version | Years | Codes |
|---|---|---|
| 1.8 T 20v 150 hp (AEB/AGU/ARZ/AUM, 1996-2005) | 1996–2005 | AEBAGUARZAUM |
| 1.8 T 20v 180 hp (AUQ, 1998-2006) | 1998–2006 | AUQ |
| 1.8 T 20v 225 hp quattro (BAM, 1999-2006) | 1999–2006 | BAM |
Models fitted with the affected versions
Audi
- Audi A3 I1996–2003
- Audi A4 B51994–2001
- Audi A4 B62000–2004
- Audi TT I1998–2006
Seat
- Seat León I1999–2006
- Seat Toledo II2003–2004
Škoda
- Škoda Octavia I2001–2005
- Škoda Superb I2001–2008
Volkswagen
- Volkswagen Golf IV1997–2003
- Volkswagen Bora1998–2005
- Volkswagen Passat B51996–2005
How much it costs to repair
Includes: Replacement of the faulty coil or coils (the engine has four, one per cylinder).[1]
We have not found a published quote in Spain for this repair on this engine.
Prices in Spain, including VAT. A workshop hour costs on average €38–66 at independent garages and €77–134 at dealerships in Spain, depending on the region and the brand. How we calculate costs
How to check for it before buying a used car
- Start the engine from cold and leave it idling for a few minutes: a coil fault is usually noticed straight away as hesitation or a rough idle.
- Ask whether the coils have already been replaced and at what mileage, especially if the car was built between 2001 and 2003.[1]
Parts needed
The part or kit that fixes this fault, according to the sources.
Ignition coil (per cylinder)
Produces the spark for that cylinder; it is mounted directly on the spark plug, with no separate high-tension leads.
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How to prevent it
- If you notice hesitation or the warning light flashing, do not keep driving for long: identify which cylinder is failing as soon as possible so you do not strain the catalytic converter or the spark plugs.
Recalls, campaigns and claims
As of 27 September 2026, we have no record of recalls, campaigns or extended manufacturer warranties for this fault. Check with an official dealer using the chassis (VIN) number: they will tell you whether the car has any outstanding campaign.
What owners say
Frequently asked questions
Is it normal for a 1.8T to suffer ignition coil failures?
It is one of the most cited faults of this engine: a German used-car specialist describes it as a frequent problem, especially on 2001 to 2003 units, and owner reports repeat it across several models and power outputs.[1][4][5]
How can you tell a faulty ignition coil on the 1.8T?
Through hesitation or loss of power on one cylinder, a rough idle and the engine warning light coming on, sometimes intermittently.[2][3]
Do all four coils have to be replaced at the same time?
The sources consulted do not document that practice: normally the coil of the failing cylinder is replaced. That said, several owner reports show repeated replacements on the same car over the years, on a different cylinder each time.[3]
What can you do now?
We will put you in touch with a partner only if you authorise it in the form.
Other 1.8 T 20v faults
- High severityFrequency: OccasionalTurboTurbo wear and oil consumptionThe 1.8T turbo can fail over time -cases documented on an Audi TT at 60,000 and 155,000 km- and several sources link it to growing oil consumption in the engine itself. It is not the most cited fault, but it is one of the most expensive when it appears.
- Medium severityFrequency: OccasionalCoolingWater pump failureThe water pump is another documented weak point of the 1.8T: a 180 hp Audi TT had to have it replaced twice, at 110,000 and again at 130,000 km. Coolant leaks "in several places" are also described on a Passat with this engine.Appears at around 110,000 km
- Medium severityFrequency: OccasionalTimingTiming chain tensioner noise and wearAt least one owner documents the timing chain tensioner of this engine left unreplaced, with the resulting chain noise, on a Passat with 184,000 km; another report from a 180 hp Audi TT points to a timing problem at 90,000 km.
- Low severityFrequency: CommonIntakeAir mass meter (MAF sensor) failureThe air mass meter (MAF sensor) fails fairly often on the 1.8T: on the 150 hp Audi A3 it appears in 3 of the 11 reports collected, and it is also documented on the 180 and 225 hp Audi TT. It causes hesitation and loss of power; it is fixed by replacing the sensor.
More faults with the ignition coils on other engines and cars
- Medium severityFrequency: Very frequent1.4 and 1.6 16vIgnition coil failureThe individual ignition coils are the most-cited fault of the K4J/K4M in the European Renault versions: they fail frequently and cause jerking, loss of power and the engine warning light coming on. It is a cheap electrical part to replace, not internal engine damage.Appears at around 30,000 km
- High severityFrequency: Occasional1.2 PureTechSpark plug breakage on the 130 hp 1.2 PureTech turboOn the 130 hp 1.2 PureTech/e-THP turbo the original spark plugs can break; if a fragment falls into the cylinder it can damage the engine. Autojournal cites a 2015 recall to replace them on the 308 II.
- Medium severityFrequency: CommonBMW N43/N46Injector, ignition coil and NOx sensor failures (N43)On the direct-injection BMW N43, failures of the injectors, ignition coils (mainly in 2007-2008 units, now rare after a BMW service action) and the NOx sensor of its lean-burn combustion have been documented. The indirect-injection N46 does not have that sensor and does not suffer these failures.
- Medium severityFrequency: CommonBMW N54/N55Oil in the spark plug wells from the rocker cover gasketOn the N54 and N55 the rocker cover gasket hardens with age and lets oil seep into the spark plug wells. Guides treat it as a known fault: it smells of burnt oil and can damage spark plugs and coils.
- Medium severityFrequency: Common1.0/1.2/1.4 EcotecIgnition coil failureThe ignition coils on this engine fail fairly often in the Corsa, Astra, Meriva and Adam, causing jerking, the engine warning light and, in the clearest cases, the engine running on one cylinder fewer; the garage fixes it by replacing the affected coil.Repair (garage): €150–€480Appears at around 15,000 km
- Medium severityFrequency: Common1.4 TurboIgnition coil failureThe ignition coils of the 1.4 Turbo fail fairly often on the Mokka and Meriva B, with jerking, occasional loss of power and the engine warning light on; the garage fixes it by replacing the affected coil or coils.Repair (garage): €400–€600Appears at around 47,000 km
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Sources
Every fact on this page links to its source. If you find an error, let us know.
- Seat Leon Mk1: Probleme, Schwachstellen, ErfahrungenGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
- Fiabilité et pannes Volkswagen Golf IVFiches-auto.fr · Other source · consulted 27 September 2026 · in French
- Fiabilité et pannes Volkswagen PassatFiches-auto.fr · Other source · consulted 27 September 2026 · in French
- Fiabilité et pannes Audi A3Fiches-auto.fr · Other source · consulted 27 September 2026 · in French
- Fiabilité et pannes Audi TTFiches-auto.fr · Other source · consulted 27 September 2026 · in French