P0301 Toyota

Cylinder 1 Misfire Detected

Table of contents

• Possible Causes
• How To Fix
• Tech Notes
• Cost To Diagnose
• When is the code detected
• Possible Symptoms
• Description

P0301 TOYOTA Possible Causes

• Faulty spark plug 1
• Clogged or faulty fuel injector 1
• Faulty ignition coil 1
• Fuel injector 1 harness is open or shorted
• Fuel injector 1 circuit poor electrical connection
• Ignition coil 1 harness is open or shorted
• Ignition coil 1 circuit poor electrical connection
• Insufficient cylinder 1 compression
• Incorrect fuel pressure
• Intake air leak

How do I fix code P0301 TOYOTA?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Tech Notes

  User Submitted Video

Cost of diagnosing the P0301 TOYOTA code

  The cost of diagnosing the P0301 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected

  Engine Cylinder 1 is misfiring.

Possible Symptoms

• Engine Light ON (or Service Engine Soon Warning Light)
• Lack/loss of power
• Hard start
• Engine hesitation

P0301 TOYOTA Description

  When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.