Guides
Practical know-how on replacement engines, gearboxes and parts: finding your engine code, choosing the right unit, core deposits and installation. For workshops, dealers and anyone who needs to replace an engine or gearbox.
Used vs remanufactured engine: which one should you choose?
Used vs remanufactured engine: we explain the difference between used, overhauled and new engines and gearboxes, compare warranty and use cases, and show what to check before you buy.
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DSG Gearbox Problems: Failure Symptoms, Causes and Options
DSG gearbox problems explained: the typical failure symptoms, the causes most often behind them and when a repair, a new mechatronic unit or a replacement gearbox is the better choice.
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Core deposit on engines and gearboxes: how to get it back
What is a core deposit (core charge) on an engine or gearbox, why does it exist and how do you get it back in full? The process, conditions, workshop tips and common mistakes.
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Renault H4D Engine: 1.0 SCe & TCe, Codes and Replacement
The Renault H4D engine explained: the 1.0-litre three-cylinder as SCe and TCe, Renault, Dacia and Nissan models, variants such as H4D 470 and 480, and what to check on a replacement engine.
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Mercedes M254 Engine: Engine Number, Mild Hybrid & Replacement
The Mercedes M254 engine explained: four-cylinder petrol engine with 48-volt ISG, how to read engine number 254.920, which models use it and what to check on a used M254.
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722.6 Gearbox: 5G-Tronic Problems, Codes and Replacement
The Mercedes 722.6 gearbox (5G-Tronic) explained: common 5G-Tronic problems such as a leaking connector and limp mode, the transmission number, fluid service and finding the right replacement.
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ZF 8HP gearbox: versions, 8HP problems and replacement
What is the ZF 8HP gearbox? Designations such as 8HP45 and GA8HP50Z explained, the 8HP problems most often mentioned, and what to check when buying a used or remanufactured replacement.
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DQ381 Gearbox: Technology, Problems and the Right Replacement
The DQ381 gearbox is the Volkswagen Group's wet 7-speed DSG. Where it is fitted, common problems, maintenance and how to find the right replacement using the gearbox code.
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DQ200 problems: mechatronic, clutch and replacement gearbox
DQ200 problems explained: how the 7-speed dry-clutch DSG works, what lies behind judder and mechatronic faults, and how to use the gearbox code to find the right replacement unit.
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7G-Tronic problems: the Mercedes 722.9 gearbox explained
Harsh shifts or limp mode? How to trace 7G-Tronic problems on the Mercedes 722.9 gearbox, find the gearbox number and choose the right used or remanufactured replacement.
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BMW B48 Engine: Codes, Common Issues & Replacement
The BMW B48 engine explained: engine codes B48A20 and B48B20, BMW and MINI models, commonly mentioned issues and what to check when buying a B48 replacement engine.
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Find your engine code: where it is and why it matters
Where is the engine code on VW, Mercedes, BMW and other makes? How to find engine and gearbox codes, use the VIN and make sure you buy the right replacement engine or gearbox.
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