P0204
High SeverityInjector Circuit Malfunction - Cylinder 4
Fuel System
P0204 — Instant Answer
Injector Circuit Malfunction - Cylinder 4
Severity: HIGH SEVERITY
Meaning: Cylinder 4 injector circuit fault.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $40 - $150
Most common causes:
- 1. Faulty injector (35-45% of cases)
- 2. Wiring issue (10-25% of cases)
- 3. Connector corrosion (10-25% of cases)
Common Causes
How to Diagnose P0204
- 1Check connector
- 2Test resistance
- 3Swap with another injector
- 4Replace if confirmed
OEM Procedures for P0204
P0204 affects the Fuel Injector. Found 103 OEM service manual procedures.
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Showing 8 of 103 procedures
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0204 to pinpoint the cause before buying parts.
TopScan
$51.27
DIYers who want phone-based scanning
View on TOPDON
ArtiLink600
$99
DIYers working on ABS/airbag systems
View on TOPDONGot a repair estimate for P0204? Check if the quote is fair before ordering parts.
Turn This Into a Confident Next Step
Verify the likely fault first, then compare a quote before you approve expensive work.
Affiliate disclosure: We may earn a commission at no extra cost to you.
View supporting tool options
OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Shop on Amazon →Battery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Shop on Amazon →Multimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Shop on Amazon →Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0204.
Related Codes
Frequently Asked Questions
- Is cylinder 4 easy to reach?
- On inline-4 engines, cylinder 4 is at one end. On V-engines, check your firing order to find which physical cylinder is number 4.
- Can fuel injector cleaner help?
- Not for P0204 — this is an electrical circuit fault, not a clogged injector. Cleaner helps with flow issues, not electrical problems.
Get the Complete Maintenance Schedule for P0204 drivers
Oil, filters, belts, brakes, and fluid intervals sent to your inbox. Unsubscribe anytime.
Not sure you want to DIY? Compare local shop pricing first.
Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07