P0402 2002 Ford F150 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 2002 Ford F150 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 2002 Ford F150 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 2002 Ford F150?
- 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
How to Fix the DTC P0402 2002 Ford F150?
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.
Code Tech Notes
There is a factory service bulletin for 2002 Ford F-150:
2002 Ford F-150 Factory Service Bulletin OBDII Code P0402 Code
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0402 2002 Ford F150 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 P0402 2002 Ford F150 code?
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Frequently Asked Questions about P0402 2002 Ford F150 Code
1. What are the common symptoms of OBDII code P0402 on a 2002 Ford F150?
The common symptoms of code P0402 on a 2002 Ford F150 include rough idling, decreased fuel efficiency, engine knocking or pinging, and potential stalling.
2. What can cause the OBDII code P0402 to trigger on a 2002 Ford F150?
The code P0402 on a 2002 Ford F150 is typically triggered when the Exhaust Gas Recirculation (EGR) system detects excessive flow, often caused by a malfunctioning EGR valve or clogged EGR passages.
3. How serious is the OBDII code P0402 on a 2002 Ford F150?
While the code P0402 may not cause immediate danger to the vehicle, it can lead to poor engine performance, increased emissions, and potential long-term damage if left unresolved.
4. What are some DIY repair tips for OBDII code P0402 on a 2002 Ford F150?
DIY repair tips for code P0402 may include checking and cleaning the EGR valve, inspecting and clearing any clogged EGR passages, and ensuring proper vacuum lines and electrical connections.
5. Can driving with the OBDII code P0402 on a 2002 Ford F150 cause further damage?
Continued driving with code P0402 on a 2002 Ford F150 can lead to decreased engine efficiency, increased emissions, and potential damage to the catalytic converter over time.
6. How much does it typically cost to repair OBDII code P0402 on a 2002 Ford F150?
The cost of repairing code P0402 on a 2002 Ford F150 can vary depending on the underlying issue, but it may range from $100 to $500 for parts and labor.
7. Can resetting the OBDII code P0402 on a 2002 Ford F150 make it go away permanently?
Resetting the code P0402 on a 2002 Ford F150 may temporarily clear the warning, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain distance.
8. What is the role of the EGR valve in triggering the OBDII code P0402 on a 2002 Ford F150?
The EGR valve controls the flow of exhaust gases back into the intake manifold to reduce emissions and regulate engine temperature. A malfunctioning EGR valve can lead to excessive flow detected by the system, triggering code P0402.
9. Are there any recalls or technical service bulletins related to OBDII code P0402 on a 2002 Ford F150?
It's recommended to check with Ford dealerships or online resources for any recalls or technical service bulletins related to code P0402 on a 2002 Ford F150 to see if there are any known issues or solutions provided by the manufacturer.
10. How can a mechanic diagnose the specific cause of OBDII code P0402 on a 2002 Ford F150?
A mechanic may use a scan tool to monitor EGR system data, test the EGR valve and associated components for proper operation, inspect for vacuum leaks, and perform a smoke test to identify the source of excessive EGR flow triggering code P0402.
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