When your engine warning light comes on and you scan for codes, injector-related errors can be confusing. Here’s a clear breakdown of what those fault codes really mean and how to respond.
Common Injector Fault Codes (OBD-II)
| Code | Meaning | Action Needed |
|---|---|---|
| P0201–P0208 | Injector circuit fault (cylinder-specific) | Check wiring and injector resistance |
| P2146–P2149 | Injector group supply voltage issue | Inspect power to injector circuits |
| P0301–P0308 | Misfire detected (cylinder-specific) | May be related to injector spray or timing |
| P1291 / P1293 | Injector output open / short | Likely internal injector failure |
How to Scan and Understand Codes
- Use an OBD-II scanner (wireless or handheld)
- Look for cylinder-specific patterns (e.g., only P0203 = cylinder 3)
- Pair fault codes with symptoms (smoke, rough idle, etc.)
- Reset and test drive to see if codes return
What do to next: Diagnose or Replace?
Electrical injector faults can sometimes be wiring issues, but mechanical failure is common in older or dirty injectors. If cleaning or clearing codes doesn’t help, replacement is often needed.
Need Help Matching Fault Code to a Part?
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