AutoCodes – Scion – P0302 Scion

P0302 Scion Code - Cylinder 2 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 #2, Faulty ignition coil #2. 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: P0302 Scion indicates Cylinder 2 Misfire Detected.
Common causes: Common causes include Intake air leak, Faulty spark plug #2, Faulty ignition coil #2.
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 22,396

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 P0302 Scion 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 P0302 Scion - Cylinder 2 Misfire Detected - AutoCodes.com — P0302 Scion Code - Cylinder 2 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 Scion?

Intake air leak
Faulty spark plug #2
Faulty ignition coil #2
Clogged or faulty fuel injector #2
Fuel injectors #2 harness is open or shorted
Fuel Injectors #2 circuit poor electrical connection
Ignition coils #2 harness is open or shorted
Ignition coils #2 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 P0302 Scion?

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 P0302 code means that cylinder #2 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 #2. 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 P0302 Scion 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 P0302 Scion code?

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Need Help with the Code?

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Information for Specific Scion Models

P0302 2005 Scion xB — Cylinder 2 Misfire Detected
P0302 2006 Scion xB — Cylinder 2 Misfire Detected
P0302 2007 Scion xB — Cylinder 2 Misfire Detected

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 P0302 Scion Code

1. What are common symptoms of OBDII code P0302 in a Scion, indicating a cylinder 2 misfire?

- Common symptoms include rough idle, loss of power, engine vibration, and potential increase in fuel consumption.

2. What are the possible causes of a cylinder 2 misfire detected in a Scion triggering OBDII code P0302?

- Possible causes may include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or issues with the engine's compression.

3. How can I diagnose the source of a cylinder 2 misfire in my Scion when experiencing code P0302?

- Diagnostic steps may involve checking the spark plugs, ignition coils, fuel injectors, vacuum lines, and performing a compression test on cylinder 2.

4. Can driving with OBDII code P0302 (cylinder 2 misfire) in a Scion cause further damage to the engine?

- Continuing to drive with a misfire can potentially cause damage to the catalytic converter, so it is recommended to address the issue promptly.

5. Are there any simple DIY repairs I can attempt to fix a cylinder 2 misfire in my Scion triggering code P0302?

- DIY repairs may include replacing spark plugs, swapping ignition coils, or cleaning/replacing fuel injectors, depending on the identified issue.

6. How important is it to address OBDII code P0302 (cylinder 2 misfire) in a Scion promptly?

- Addressing code P0302 promptly is essential to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.

7. Can a cylinder 2 misfire in a Scion causing OBDII code P0302 be intermittent or sporadic?

- Yes, a misfire can be intermittent, occurring only under specific conditions, making diagnosis and repair more challenging.

8. What is the typical cost to repair a cylinder 2 misfire detected in a Scion leading to code P0302?

- The cost of repair can vary depending on the exact cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Will resetting the OBDII system clear code P0302 related to the cylinder 2 misfire in my Scion?

- Resetting the system may clear the code temporarily, but if the underlying issue causing the misfire is not addressed, the code is likely to return.

10. Is it advisable to seek professional help for diagnosing and repairing OBDII code P0302 (cylinder 2 misfire) in a Scion?

- Yes, it is recommended to consult a qualified mechanic or technician to accurately diagnose and repair the underlying issue causing the misfire and code P0302.

Discuss the causes and fixes for P0302 Scion OBDII Code

Submit a New Comment

Juan A. Ramos
Date: August 3, 2014 at 5:47 pm

I just bought the 2006 scion xb . Last night the check engine light came on and the car started to missfire. I went to advance auto and the code was p0302. Is this an easy fix?

Reply to Comment
OBDIITech
Date: August 5, 2014 at 12:02 am

It depends what the problem is. I suggest starting by replacing the #2 spark plug, replaced all spark plugs if necessary.

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