P0203
High SeverityInjector Circuit Malfunction - Cylinder 3
Fuel System
P0203 — Instant Answer
Injector Circuit Malfunction - Cylinder 3
Severity: HIGH SEVERITY
Meaning: Cylinder 3 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. Bad connector (10-25% of cases)
Common Causes
How to Diagnose P0203
- 1Check connector
- 2Test resistance
- 3Swap with another injector
- 4Replace if confirmed bad
OEM Procedures for P0203
P0203 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
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Repair guides, symptom pages, and wiring diagrams related to P0203.
OEM Manual Evidence
Browse →Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Related Symptoms
Browse →Related Codes
Frequently Asked Questions
- How much does injector replacement cost?
- DIY: $40-$150 per injector. Mechanic: $150-$400 including labor.
- Can I drive with a dead injector?
- You can limp home but driving with a dead cylinder sends raw fuel into the exhaust, damaging the catalytic converter.
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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