AutoCodes – Toyota – P0303 2013 Toyota RAV4

P0303 2013 Toyota RAV4 Code - Cylinder 3 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Common causes include Intake air leak, Faulty spark plug #3, Faulty ignition coil #3. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0303 2013 Toyota RAV4 indicates Cylinder 3 Misfire Detected.
Common causes: Common causes include Intake air leak, Faulty spark plug #3, Faulty ignition coil #3.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 640

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0303 2013 Toyota RAV4 Description

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the Engine Control Module (ECM) monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0303 2013 Toyota RAV4 - Cylinder 3 Misfire Detected - AutoCodes.com — P0303 2013 Toyota RAV4 Code - Cylinder 3 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2013 Toyota RAV4?

Intake air leak
Faulty spark plug #3
Faulty ignition coil #3
Clogged or faulty fuel injector #3
Fuel injectors #3 harness is open or shorted
Fuel Injectors #3 circuit poor electrical connection
Ignition coils #3 harness is open or shorted
Ignition coils #3 circuit poor electrical connection
Incorrect Fuel pressure
Faulty Mass Air Flow (MAF) Sensor
Faulty Engine Control Module (ECM)
Faulty Engine Coolant Temperature (ECT) Sensor

How to Fix the DTC P0303 2013 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0303 code means that cylinder #3 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #3. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0303 2013 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0303 2013 Toyota RAV4 code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0303 2013 Toyota RAV4 Code

What does the OBDII code P0303 mean for a 2013 Toyota RAV4?

P0303 indicates a misfire has been detected in cylinder 3 of the engine.

What are common symptoms of a P0303 code in a 2013 Toyota RAV4?

Symptoms may include rough idle, reduced engine performance, poor fuel economy, and the check engine light turning on.

What causes a cylinder 3 misfire in a 2013 Toyota RAV4?

Common causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leaks, or low engine compression.

Can I drive my 2013 Toyota RAV4 with a P0303 code?

Driving with a P0303 code is not recommended as it can cause engine damage or catalytic converter failure if the misfire persists.

How can I diagnose the P0303 code in a 2013 Toyota RAV4?

Diagnosis typically involves inspecting the spark plug, ignition coil, fuel injector, and performing a compression test on cylinder 3.

How do I fix a P0303 code on a 2013 Toyota RAV4?

Repairs may include replacing the spark plug, ignition coil, or fuel injector for cylinder 3, fixing vacuum leaks, or addressing low compression issues.

What tools are needed to troubleshoot a P0303 code?

You may need an OBDII scanner, multimeter, spark plug wrench, and compression tester for proper diagnosis.

Can bad fuel cause a P0303 code in my 2013 Toyota RAV4?

Yes, poor-quality or contaminated fuel can lead to misfires, including in cylinder 3.

How much does it cost to repair a P0303 code on a 2013 Toyota RAV4?

Repair costs vary widely depending on the issue, ranging from $100 for a spark plug replacement to over $1,000 for major engine repairs.

Will resetting the code fix the P0303 issue on a 2013 Toyota RAV4?

Resetting the code will clear the check engine light temporarily, but the underlying issue causing the misfire must be addressed to properly resolve the problem.