Warning light diagnostics
Engine, ABS, airbag or charging light: from the stored code to a measured cause.
from 3,500 RSD
A diagnostics lab for cars
Measured, not guessed
Piston Lab finds the cause of electrical and electronic faults by measuring: warning lights, sensors, faults that only appear now and then, and pre-purchase checks. You get written findings, and the repair starts only once you approve them.
- Measuring before any part is replaced
- Written findings with measured values
- Repairs only once you approve the proposal
- Your car's status through a personal link
01 Services
A protocol for every fault
Ten services, each showing what we measure, how it goes, a typical duration and a starting price.
Intermittent faults
A fault that only shows when cold, in the rain or after an hour's driving is caught by logging data on the road.
from 9,000 RSD
Parasitic battery drain
A battery that's flat in the morning is measured while the car is locked, to find the consumer that won't go to sleep.
from 4,500 RSD
02 Method
First the measurement, then the tools
Every case follows the same order: symptom, measurement, confirmed cause, proposal, repair and a check measurement.
- 01
We record the symptoms and when they appear
- 02
We read, measure and capture signals
- 03
We confirm the cause and send findings with a price
- 04
We repair with your approval and measure again
Online
Four ways into the lab, without waiting on the phone
01
Booking
Choose a service and a free slot. Slots come straight from the workshop's schedule.
02
Repair estimate
Describe the problem and send photos. You get an indicative estimate before you come in.
03
Repair tracking
Follow your car's status through a personal, protected link from the workshop.
04
Reminders
Service and registration reminders by email or SMS, only with your consent.
03 Before & after
Cause found, fault fixed
Drag the slider to compare before and after the repair.
BeforeAfterBattery terminalsCorroded terminals cleaned and replaced, cranking voltage drop measured again.Service: Battery, charging & starting
Drag to compare before and after
04 Testimonials
What drivers say about the findings
Sample testimonials showing how this page will look. The lab replaces them with real ones and their source.
#01Driver (sample)Estate, diesel, 2015 · Parasitic drainSample contentSample testimonial I'd replaced the battery twice. Here they measured the sleep current and found an aftermarket charger that never went to sleep.
#02Driver (sample)Compact hatchback, 2013 · Intermittent faultsSample contentSample testimonial The fault only showed after a long drive in the rain. They logged data on the road and showed me the graph where the dropout appears.
#03Driver (sample)SUV, petrol, 2017 · Pre-purchase checkSample contentSample testimonial The seller said the light was just a sensor. The report showed the codes had been cleared the day before, so I walked away.
05 FAQ
Questions before the test
Booking, findings, prices, warranty, tracking your car and reminders.
06 Notes
Notes from the lab
Practical articles on electrics, sensors and diagnostics, without the sales talk.
Guides6 min read
Flat battery every morning: how the cause is found
What sleep current is, why disconnecting the battery spoils the test and the usual culprits.
October 16, 2026
Guides7 min read
The fault that comes and goes: catching an intermittent fault
Why an intermittent fault can't be solved by reading a code, and how you can help catch it.
October 16, 2026
Safety5 min read
Dashboard warning lights: colours, urgency and first steps
What red, amber and green lights mean, when to stop at once and when booking a diagnosis is enough.
October 16, 2026
Online
Book a visit
Choose a service and a free slot. Slots come straight from the workshop's schedule.