Since the 1980s, carmakers have made huge advances in engine technology, aiming for higher performance, greater fuel efficiency and lower emissions. However, some designs have not always lived up to expectations. Here’s a list of the five most unreliable modern engines, infamous for their recurring problems and high repair costs.
The THP (Prince) engine – PSA/BMW
The THP (Turbo High Pressure) engine, developed jointly by PSA Peugeot-Citroën and BMW, is a 1.6L turbo engine. Despite its seductive performance, this engine has suffered from a series of chronic problems. Owners have reported brittle timing chains, carbon deposits in the valves and excessive oil consumption. These problems, coupled with costly repairs, have severely tarnished the reputation of this engine, which can be found in vehicles such as the Mini, Peugeot 208 GTi and Citroën DS3.
The PureTech 1.2L engine – PSA (Peugeot-Citroën-Opel)
This 3-cylinder engine, which has won several awards for its innovation and performance, has quickly seen its reliability called into question. Recurring problems include a wet timing belt that degrades prematurely, leading to engine damage if not changed in time. Many drivers have also reported sudden power losses and engine alerts, making this engine as unpredictable as it is expensive to maintain.
The 1.0L EcoBoost engine – Ford
Ford’s EcoBoost engine, a small 3-cylinder turbo, has been acclaimed for its fuel efficiency and low emissions. However, it has earned an unenviable reputation for serious overheating problems. The lack of adequate cooling led to cracks in the engine block and, in some cases, fires. These problems forced Ford to recall thousands of vehicles worldwide, including models such as the Fiesta and Focus.
The 2.0T TFSI engine – Audi/Volkswagen
The 2.0L direct injection turbo engine in the TFSI range, used by Audi and Volkswagen, suffered from problems of excessive oil consumption. This fault, often attributed to poor piston ring design, led to costly repairs and widespread owner dissatisfaction. Although the engine has been modified over the years, its early versions, notably in the Audi A4 and VW Passat, remain a nightmare for many motorists.
The N47 engine – BMW
BMW’s N47 diesel engine, a 4-cylinder offered between 2007 and 2015, is infamous for its timing chain problems. Located at the rear of the engine, this chain was not only prone to premature wear, but its replacement often required the entire engine to be dismantled. This problem affected popular models such as the 1 Series, 3 Series and 5 Series, leading to a loss of confidence among enthusiasts.
Thank you, thanks to this blog I will know how to take a good look at the engine of my future car to avoid encountering too many problems ! Can you recommend an engine which is known for its reliability?
purtech is a nest of problems, run away from it!!!!!!!!!