P2304
Ignition Coil D Secondary Circuit
2003-2003 Mazda B2300 2.3L I4
High SeverityPowertrainGeneric (SAE)
The 2003 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed p2304 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Fault in ignition coil D secondary circuit (typically cylinder 4).
Symptoms
- Cylinder 4 misfire
- Check engine light
- Engine shaking
Common Causes
- Failed coil
- Spark plug fouled
- Carbon tracking
Diagnostic Steps
- Coil swap test
- Plug inspection
- Check for oil in spark plug well
Repair Notes
Replace coil. Check valve cover gasket if oil in plug well.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P2304 on Other Vehicles
Common Questions
What does code P2304 mean on a 2003-2003 Mazda B2300?
P2304 stands for "Ignition Coil D Secondary Circuit". Fault in ignition coil D secondary circuit (typically cylinder 4).
What are the symptoms of P2304 on a Mazda B2300?
Common symptoms of P2304 include: Cylinder 4 misfire, Check engine light, Engine shaking.
What causes P2304 on a 2003-2003 Mazda B2300?
Common causes of P2304 include: Failed coil, Spark plug fouled, Carbon tracking.
Last updated: March 2026