P0402 1999 Toyota Camry Code - Exhaust Gas Recirculation Flow Excessive Detected
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Common causes include EGR volume control valve stuck open, Faulty EGR volume control valve, EGR solenoid valve harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0402 1999 Toyota Camry indicates Exhaust Gas Recirculation Flow Excessive Detected.
- Common causes
- Common causes include EGR volume control valve stuck open, Faulty EGR volume control valve, EGR solenoid valve harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0402 1999 Toyota Camry Description
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
What are the Possible Causes of the DTC P0402 1999 Toyota Camry?
- EGR volume control valve stuck open
- Faulty EGR volume control valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit
- Manifold absolute pressure sensor
- ECM
How to Fix the DTC P0402 1999 Toyota Camry?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0402 1999 Toyota Camry 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.
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Frequently Asked Questions about P0402 1999 Toyota Camry Code
1. What are common symptoms of OBDII code P0402 in a 1999 Toyota Camry?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and a possible check engine light.
2. What does the OBDII code P0402 "Exhaust Gas Recirculation Flow Excessive Detected" mean for a 1999 Toyota Camry?
- It indicates that the EGR system is allowing too much exhaust gas to flow into the intake manifold, affecting engine performance and emissions.
3. What are the possible causes of OBDII code P0402 in a 1999 Toyota Camry?
- The causes can include a faulty EGR valve, blocked EGR passages, a malfunctioning EGR temperature sensor, or a problem with the EGR vacuum control solenoid.
4. How can I diagnose the OBDII code P0402 in my 1999 Toyota Camry?
- Diagnosis typically involves checking the EGR valve for proper operation, inspecting EGR passages for blockages, testing the EGR temperature sensor, and verifying the EGR vacuum control solenoid's functionality.
5. Can I still drive my 1999 Toyota Camry with OBDII code P0402?
- It's not recommended to drive for an extended period with this code as it can lead to further engine damage and increased emissions. It's best to address the issue promptly.
6. What are some repair tips for fixing OBDII code P0402 in a 1999 Toyota Camry?
- Repair tips include cleaning or replacing the EGR valve, clearing out any clogged EGR passages, testing and replacing the EGR temperature sensor if necessary, and ensuring the EGR vacuum control solenoid is functioning correctly.
7. Can a DIY enthusiast fix OBDII code P0402 in a 1999 Toyota Camry?
- Depending on your experience and tools available, some aspects of diagnosing and repairing the issue may be manageable as a DIY project. However, complex EGR system components may require professional help.
8. How much does it cost to repair OBDII code P0402 in a 1999 Toyota Camry?
- The cost of repair can vary based on the specific issue causing the code, the labor rates in your area, and whether you choose to replace parts yourself or have a mechanic do the work. Costs can range from a few hundred to over a thousand dollars.
9. Will resetting the OBDII code P0402 in a 1999 Toyota Camry make it go away permanently?
- Resetting the code may temporarily clear the check engine light, but if the underlying issue causing P0402 is not addressed, the code is likely to reappear once the EGR system detects the same problem again.
10. How often does OBDII code P0402 occur in a 1999 Toyota Camry?
- While not extremely common, P0402 can occur in a 1999 Toyota Camry due to factors like age, mileage, and maintenance history. Regular servicing of the EGR system can help prevent this code from appearing.
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