The automatic transmission control unit (often designated as TCU or TCM) is a crucial electronic component responsible for smooth and trouble-free gear shifting. Its failure, most often caused by overheating, short circuits, or water damage, results in jerking, an inability to shift gears, or the vehicle entering limp mode. Purchasing a new module at an authorized dealership is a massive expense, which is why replacing it with a fully functional, used original is the most reasonable solution.
Throttle Body Smart Fortwo (451) Mikuni 40002 84171289
Vendors's code: 40002
Product code: 84171289
Barcode:
Code 39:
ISBN:
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Throttle body 40002 Mikuni – is it the right part for your car?
This is a used, working Mikuni throttle body with part numbers 40002 and 84171289, for: Smart Fortwo (451) (engines: 1.0). To confirm the fit, compare the number with the label on the throttle body in your car.
Throttle Body Mikuni 40002 84171289 – Smart Fortwo (451)
The Mikuni 40002 throttle body controls the amount of air drawn into a petrol engine. In electronic throttle bodies, the throttle plate position is set by the engine control unit based on the accelerator pedal signal. According to the product data, it fits: Smart Fortwo (451); engines: 1.0.
Part numbers to compare
- 40002
- 84171289
The label on the throttle body fitted to your car should show the number 40002 or 84171289. The model name alone (Smart Fortwo (451)) is not enough – throttle bodies with other numbers were also fitted to these cars.
Common throttle body faults
When the throttle body in a Smart starts to fail, the most common signs are:
- worn track in the throttle position sensor – fluctuating revs, jerking on light throttle,
- carbon deposits on the throttle plate – rough idle, engine stalling when coming to a stop,
- in electronic throttle bodies: failed motor or gear drive – limp mode, reduced power, engine warning light.
When measurements or fault codes confirm the problem and cleaning has no effect, the throttle body is replaced with one carrying the same number. After replacement, many cars need an adaptation in the engine control unit.
Questions and answers
| How do I check that the 40002 throttle body fits my car? |
|---|
| Compare the number 40002 or 84171289 with the label of the throttle body fitted to your car (Smart Fortwo (451)). |
| Which engines does the 40002 throttle body fit? |
| According to the product data, it fits 1.0 engines in: Smart Fortwo (451). |
| Does the throttle body need to be adapted (relearned) after replacement? |
| In many cars, yes: after fitting, the engine control unit learns the end positions of the throttle. This is done with a diagnostic tool or by following the procedure described by the car manufacturer. |
| What condition is this throttle body in? |
| It is a used, working unit in good condition. The warranty is listed in the product specification table. |
Need help choosing a part for your Smart? Send us the number from your throttle body's label and we will confirm whether this part will fit.