Among the most discussed problems with the 1.2 PureTech engines installed on Citroën, Peugeot, Opel, and DS , there is also a lesser-known but rather common defect: the failure or premature wear of spark plugs . This phenomenon, often linked to other mechanical problems with the engine, can lead to reduced performance, misfires, and much more serious damage if left untreated.
Read Also: THE MAIN PROBLEMS OF THE 1.2 PURETECH ENGINE: WHAT TO KNOW AND HOW TO PREVENT THEM
In this article, we'll explore why spark plugs fail prematurely , what signs to watch for, and what to do to avoid it. We'll also focus on Italy and preventative maintenance.
Read also: WHAT HAPPENS IF THE SPARK PLUGS BREAK IN 1.2 PURETECH ENGINES: IS IT COVERED BY THE WARRANTY?
⚠️ MAIN CAUSES OF PREMATURE SPARK PLUG WEAR IN PURETECH
1. Belt deterioration in oil bath
The most common related problem is the degradation of the oil-bath timing belt , found on many PureTech engines. As the belt deteriorates, it releases rubber particles into the engine oil , which eventually clog the passages and limit lubrication to the upper portion of the engine, including the cylinder head .
The result is an abnormal increase in temperatures in the combustion chamber, with overheating of the spark plugs , which wear out more quickly or become damaged until they break.
2. Aggressive engine mapping and thermal management
On some models, the ECU mapping prioritizes performance and torque at low revs. This causes temperature spikes that stress the spark plugs, especially during cold starts. In vehicles driven primarily in cities, this phenomenon is amplified.
3. Use of non-compliant candles
Many users, to save money, install aftermarket spark plugs that aren't specifically designed for PureTech engines. In reality, these engines require spark plugs with specific heat ratings, materials, and gaps . An incorrect spark plug can fail in just a few miles.
4. Replacement intervals too long
The recommended replacement interval every 60,000 km is often insufficient for those driving in severe conditions. In many cases, it's best to change the oil every 30,000-40,000 km to avoid problems.
🔎 SYMPTOMS OF WORN OR DAMAGED SPARK PLUGS
-
Difficult to start, especially when cold
-
Loss of power when accelerating
-
Abnormal vibrations at idle
-
Increased fuel consumption
-
Engine light on, often with code P0300 (multiple misfire) or P0301/P0302/P0303 (misfire on specific cylinder)
🔧 HOW TO PREVENT THE PROBLEM: PRACTICAL ADVICE
✅ Replace spark plugs sooner than necessary
Don't wait for them to cause problems: replace them every 30-40,000 km , especially if you use the car in the city or with a lot of cold starts.
✅ Use original candles or premium equivalents
Avoid cheap products: choose iridium or platinum spark plugs , approved for the 1.2 PureTech engine.
✅ Check the condition of the oil and belt
A damaged belt directly affects the health of your spark plugs. Check the condition of your oil frequently (color, density, presence of residue) and don't drive more than 60,000 km without checking the belt .
✅ Perform periodic diagnostics
A simple OBD scan can help you detect combustion problems before they cause damage to your spark plugs and engine.
Read also: OIL-BATH BELT IN 1.2 PURETECH ENGINES: A DEFECT THAT CAN BE EXPENSIVE
❌ MISTAKES NOT TO MAKE
-
Ignore small drops in power or vibrations: they are often the first signs of a bigger problem.
-
Using "universal" candles
-
Underestimating the importance of the right engine oil
-
Postpone oil bath belt replacement
❓ FAQ: FREQUENTLY ASKED QUESTIONS
Can broken spark plugs cause other damage?
Yes. A malfunctioning spark plug can damage the catalytic converter, increase fuel consumption, and compromise the overall efficiency of the engine.
Can I change the spark plugs myself?
Yes, if you have a minimum amount of manual skill and the right tools. However, access is not always easy on PureTech engines: be careful not to overtighten and to install the correct model.
Does this issue also affect the latest generation (Gen3) PureTech engines?
Newer models have brought improvements, but some isolated cases have still occurred , especially if proper maintenance is not performed.
If you notice any unusual symptoms or want to prevent unexpected breakdowns, now is the right time to check the condition of your spark plugs and other critical components.
For personalized advice, original spare parts, and in-depth technical content, visit autoricambitritella.it , the reference point for those who truly care about their car.
