Our advice
- Check the battery and the wiring harness first whenever a car will not start. They are the two causes player guides show, and a low battery only needs the charger in your garage, not a new part.
- Treat engine and turbo swaps as a risk until you know they fit. One creator could not fit a V12 into the car they tried, so we would start with the parts the car already uses.
Mechanic Legends Parts Guide, step by step
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Step 1: raise the car on the lift, open the hood and hold the wrench to see which parts are damaged. Illustration by MechanicLegends.org A wrench check under the hood
Drive the car onto the lift in your garage, raise it and open the hood. Hold the wrench to see which parts are damaged, then take those parts out. On a junkyard car you can also hold E before you buy to read its damaged parts and estimated repairs.
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Step 2: rusty or worn parts go through the ultrasonic cleaner and the part polisher and come back to 100%. Illustration by MechanicLegends.org Worn parts saved before anything is bought
Run rusty or worn parts through the ultrasonic cleaner, then the part polisher. They come back to 100%, so you do not need a new one. Player videos show this on the radiator, the exhaust manifold, the intercooler and worn wiring.
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Step 3: player guides show two reasons a car will not start, a low battery and a missing wiring harness. Illustration by MechanicLegends.org Battery and wiring harness for a car that will not start
If the car will not start, look at the battery and the wiring harness first. A low battery comes out, charges on the battery charger in your garage and goes back in. A missing harness has to be replaced. The free starter car has this fault at first, and the game gives you cash to order one.
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Step 4: order scrapped parts from the parts store, and a delivery truck brings them to your garage. Illustration by MechanicLegends.org New parts only for scrapped ones
One player guide says a scrapped part cannot be polished back, so order a new one from the parts store. A delivery truck brings it to your garage. One creator notes the delivery is free, but the part itself costs Cash.
Where people get stuck
You order a new part that could have been polished
Run rusty or worn parts through the ultrasonic cleaner and the part polisher first. They come back to 100%, so save the parts store for parts that are scrapped.
A new engine will not fit the car
Not every part fits every engine. One creator could not fit a V12 into the car they tried, so do not buy a big swap on the hope that it fits.
The car runs in limp mode or the engine light stays on
One player guide drove a car in limp engine mode until the engine was repaired, and saw the engine light go off once the damaged parts were fixed. Hold the wrench again and fix every damaged part, not just one.
Repair or replace?
As of the October 29, 2026 update, most parts in Mechanic Legends can be saved. Rusty or worn parts go through the ultrasonic cleaner and then the part polisher, and they come back to 100%. Three player channels cover this. A part needs replacing only when it is scrapped. One player guide says a scrapped part cannot be polished back, so you order a new one from the parts store instead.
Every repair starts the same way. Drive the car onto the lift in your garage, raise it, open the hood and hold the wrench to see which parts are damaged. Take the damaged parts out, fix them and put them back. If you are buying from the junkyard, hold E on a car first to read its damaged parts and estimated repairs before you pay.
This is what player videos show for each part:
| Part | What goes wrong | What to do |
|---|---|---|
| Radiator | Rusty or worn | Clean and polish it; order a new one if it is scrapped |
| Wiring harness | Missing or worn, and the car will not start | Clean worn wiring; order a new harness if it is missing |
| Battery | Low, and the car will not start | Charge it on the battery charger |
| Exhaust manifold | Worn or scrapped | Polish a worn one; replace a scrapped one |
| Engine block | Shows up as a repair task | Replace it from the parts store |
| Intercooler | Damaged | Polish it |
| Transmission | Shows up as a repair task | Take it out and repair it |
| Intake manifold | Shows up as a repair task | Take it out and repair it |
| Valve cover | In the way of engine work | Take it off and put it back |
| Turbo | An upgrade, not a repair | Fit one to the engine if it fits |
Radiator
To get a working radiator in Mechanic Legends, clean and polish the old one first, and order a new radiator from the parts store only if it is scrapped. A rusty or worn radiator comes out of the car and goes through cleaning and polishing. Three player channels show radiator work. Radiators also come up as a task on Mechanic Legends customer jobs, so expect to pull one out often.
In a real car, the radiator cools the liquid that carries heat away from the engine.
Wiring harness
A missing wiring harness stops the car from starting. The free starter car has exactly this fault at first, and the game gives you cash to order a new harness. Worn wiring is different: it can be cleaned back up instead of replaced. Wiring repairs also show up on customer jobs. Three player channels cover the harness.
In a real car, the wiring harness is the bundle of wires that carries power and signals between the battery, the sensors and the engine.
Battery
A low battery is the other reason player guides show for a car that will not start. You do not need a new one. Take the battery out, charge it on the battery charger in your garage and install it again. Three player channels show this.
In a real car, the battery powers the starter motor that turns the engine over.
Exhaust manifold
A worn exhaust manifold can be polished. A scrapped one cannot, and it has to be replaced with a new one. Two player channels show this, and it is the clearest example of the rule that scrapped parts need replacing.
In a real car, the exhaust manifold collects hot gas from each cylinder and sends it into the exhaust pipe.
Engine block
The engine block can be replaced with a new one from the parts store, and it can be one of the tasks on a customer job. Two player channels show this. The parts store also sells different engines. One creator saw an inline six engine priced at 1,500, the only engine price we have a source for.
Not every part fits every engine. One creator could not fit a V12 into the car they tried. Until more videos show which swaps work, we would not buy a new engine for a car unless you know it fits.
In a real car, the engine block is the main metal casting that holds the cylinders.
Intercooler
A damaged intercooler can be polished rather than replaced, and it can be a task on customer jobs. Two player channels show this.
In a real car, the intercooler cools the air coming out of a turbo before it goes into the engine.
Transmission
The transmission comes out of the car for repairs, and it is a common customer job task. Two player channels show this. Some customer jobs list five repair tasks, such as the engine block, intake, radiator, transmission and battery, so expect the transmission on the bigger jobs.
In a real car, the transmission uses gears to send the engine’s power to the wheels.
Intake manifold
You take the intake manifold out and repair it. It is one of the most common customer job tasks, and three player channels show it. One player guide took a job to repair the intake manifold and the wiring together.
In a real car, the intake manifold carries air into each cylinder.
Valve cover
The valve cover has to come off during engine work and go back on afterwards. It can also be a customer job task. Two player channels show this. If a part under it is damaged, the valve cover is the first thing in your way.
In a real car, the valve cover sits on top of the engine and keeps the oil inside.
Turbo
A turbo is an upgrade rather than a repair. Turbos can be fitted to the engine, and one creator built a twin turbo setup. Two player channels show turbos. The parts store sells modifications for tuning, and one creator also showed stage one and stage two ECU tunes, with the stage one tune on one car costing 13K. As with engines, make sure a part fits before you pay for it.
In a real car, a turbo uses exhaust gas to spin a fan that pushes more air into the engine.
Brakes, limp mode and the engine light
These come from single player reports, so treat them as examples:
- One creator found a starter car with no working brakes.
- One player guide drove a car in limp engine mode until the engine was repaired.
- The same guide saw the engine light go off once the damaged parts were fixed.
Together they suggest the dashboard warnings clear once the repairs are done. If a warning stays on, hold the wrench again and look for a part you missed.
In a real car, limp mode is when the engine computer cuts power to protect a damaged engine.
Wheels and tires
One player guide shows a tire machine that splits a tire from its rim, so you can fit a different rim and mount the tire back. We have no other source on it yet.
Where new parts come from
The parts store sells replacement parts, different engines and modifications for tuning. Parts you order arrive by delivery truck at your garage. One creator notes the delivery itself is free, and you pay Cash only for the parts.
Before you order anything, check whether the part can be saved. Our guide to cleaning and polishing parts covers the ultrasonic cleaner and the part polisher, and the paint shop for the car body.
Mechanic Legends Parts Guide: FAQ
Which parts can you repair in Mechanic Legends?
Most parts in Mechanic Legends can be repaired: rusty or worn ones are cleaned and polished back to 100%, and player videos show this on the radiator, exhaust manifold, intercooler and wiring. A low battery is charged instead. With the hood open, the wrench shows which parts are damaged, and one player guide says only scrapped parts must be replaced.
How do you get a radiator in Mechanic Legends?
If your radiator is rusty or worn, take it out and clean and polish it back to 100% instead of buying one. If it is scrapped, order a new radiator from the parts store, and a delivery truck brings it to your garage.
Why will my car not start in Mechanic Legends?
The two causes player guides show for a car that will not start in Mechanic Legends are a missing wiring harness and a low battery. The free starter car is missing its harness at first, and the game gives you cash to order a new one.
Where do you buy parts in Mechanic Legends?
You buy parts at the parts store, which sells replacement parts, different engines and tuning modifications. Parts you order arrive by delivery truck at your garage.
How much does an engine cost in Mechanic Legends?
One creator saw an inline six engine priced at 1,500, and that is the only engine price we have a source for. Treat it as a single player report while the game is in BETA.
Can you put a turbo on your car in Mechanic Legends?
Yes. Turbos can be fitted to the engine in Mechanic Legends, and one creator built a twin turbo setup. Not every part fits every engine, though, so a swap may not work on every car.
Is parts delivery free in Mechanic Legends?
One creator notes that delivery is free and you pay Cash only for the parts. Parts you order arrive by delivery truck at your garage.