Check engine light diagnostic cost in London (2026)
Check engine light diagnostic in London typically costs $110–$170 at independent shops, $120–$180 at chains and $150–$230 at dealerships, for a compact SUV before tax.
| Shop type | Low | Typical | High | Hourly rate |
|---|---|---|---|---|
| Independent shop | $110 | $130 | $170 | $120/h |
| Chain | $120 | $150 | $180 | $132/h |
| Dealership | $150 | $180 | $230 | $165/h |
CAD, before tax, for a compact SUV, including typical shop supplies and environmental fees. Low and high are the middle half of what shops charge. No shared invoices for this repair in London and Windsor yet: this is Fixtimate's estimate. Updated November 2026. Early estimate.
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No quote yet? Get prices for your carA check engine light diagnostic in London is the work a shop does to find out why the light is on. It covers tracing the cause so the shop can quote the repair. Independent shops are usually the lowest in price, and dealerships are usually the highest. Independent hourly rates here are among the lowest in Ontario.
What changes the price
- Most shops charge a set diagnostic fee to find the cause before they quote the repair.
- Some shops credit that fee if you have them do the repair, so ask before you agree.
- Intermittent or electrical problems can take longer to trace, and that costs more.
- Dealerships are usually the highest of the shop types, and independent shops are usually the lowest.
- Vehicle type matters. A compact car is usually the cheapest, and a pickup truck is usually the dearest.
At an independent shop in London and Windsor, the typical job is about 1.0 hours of labour at around $120 an hour.
By vehicle type
| Vehicle | Independent | Chain | Dealership |
|---|---|---|---|
| Compact car | $130 | $150 | $180 |
| Midsize car | $140 | $150 | $180 |
| Compact SUV | $130 | $150 | $180 |
| Large SUV or minivan | $130 | $150 | $180 |
| Pickup truck | $140 | $150 | $180 |
| Luxury or European | $130 | $150 | $220 |
Typical price in London, CAD before tax.
Questions drivers ask
Is a free code scan the same as a diagnostic?
No. A free code read at a parts store gives you a code, not a diagnosis. The code points to a system, not always to the part that failed. A diagnostic is where a shop traces the actual cause.
Will the shop credit the diagnostic fee?
Some shops do if you have them do the repair, and some don't. Ask before you agree to the diagnostic. Get the answer on your written estimate if you can.
Can I drive with the check engine light on?
It depends on the light and on how the car is running. Check your owner's manual for what the light means on your vehicle. If the light is flashing or the car runs rough, ask a shop before you keep driving.
Got a check engine light diagnostic quote? Check it line by line.
Upload a photo or PDF of the estimate. Fixtimate compares each line with typical prices in London and Windsor. Free.
No quote yet? Get prices for your carOther repair prices in London
Check engine light diagnostic nearby
These are typical prices, not quotes. A shop's own price depends on your car and what it finds: ask for a written estimate, then check it here. How we work out these prices. Updated November 2026.