FixFord Focus Check Engine Light On — What It Usually Means, and What It Costs
Across all vehicles, the most common cause of a check engine light is Spark Plugs (17.4%). On the Ford Focus it is EVAP Component (17.7%), so the order of suspects is different for this vehicle. The table below shows each fix for this vehicle next to the all-vehicle share, with what it costs on the Ford Focus.
What it actually turns out to be on the Ford Focus
| The fix involved | Ford Focus* | All vehicles* | Typical cost† |
|---|---|---|---|
| EVAP Component | 17.7% | 9.8% | $222 – $390 |
| Spark Plugs | 16.2% | 17.4% | $154 – $359 |
| Thermostat | 13.1% | 6.1% | $242 – $419 |
| Sensor | 10% | 14.2% | $187 – $372 |
| Oxygen Sensor | 8.7% | 11.7% | $208 – $405 |
| Ignition Coil | 8.1% | 10.7% | $196 – $357 |
| PCV Valve | 5.5% | 2.4% | $85 – $211 |
| Fuel Filter | 4.8% | 4.4% | $88 – $231 |
| Valve Cover Gasket | 4.7% | 3.6% | $161 – $344 |
| Other, rarer causes | smaller shares | — | varies |
*Share of visits whose repair involved this part, among visits for this complaint that ended in a parts repair. Combined
repairs count toward each part involved, so shares overlap and don't add up to 100%.
†Middle half of real Ford Focus invoices (25th–75th percentile) when this was the only fix, parts + labor; rows marked "all vehicles" use all vehicle types.
Real repair reports
Recent, paid Ford Focus visits for this complaint — the words as the owner said them, and what it turned out to be.
Ford Focus owners said
“Diagnose Check Engine Light/ Test Sensors/ Test Drive”
“Customer states check engine light on. check and advise”
“Missing check engine light on”
“Service engine soon light on”
“Check engine light diagnostic”
More on this problem and this vehicle
- Check Engine Light On: all vehicles — how to tell the causes apart, and what each fix usually costs
- All Ford Focus repair costs
Take this to the shop
The FixDozer Diagnosis Brief for this complaint puts the all-vehicle odds on one printable sheet. Bring it with this page: the table above shows how the Ford Focus differs.
Download the Diagnosis Brief (PDF, all vehicles)View it online · Narrow it down step by step
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