P0402 1998 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 1998 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 1998 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 1998 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 1998 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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0402 1998 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.
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Frequently Asked Questions about P0402 1998 Ford F150 Code
1. What are the common symptoms of OBDII code P0402 on a 1998 Ford F150?
When the P0402 code is triggered, you may experience symptoms like engine hesitation, rough idling, decreased fuel efficiency, and potentially the illumination of the check engine light.
2. What are the possible causes of OBDII code P0402 in a 1998 Ford F150?
The P0402 code in a 1998 Ford F150 typically indicates excessive exhaust gas recirculation (EGR) flow. Common causes include a faulty EGR valve, clogged EGR passages, or a malfunctioning EGR temperature sensor.
3. How can I diagnose the OBDII code P0402 on my 1998 Ford F150?
Diagnosing the P0402 code involves checking the EGR valve and system for proper operation, inspecting for any blockages in the EGR passages, and testing the EGR temperature sensor for functionality.
4. Can a dirty or clogged EGR valve cause code P0402 on a 1998 Ford F150?
Yes, a dirty or clogged EGR valve can restrict proper flow and lead to the triggering of code P0402 in a 1998 Ford F150. Regular maintenance and cleaning of the EGR system can help prevent this issue.
5. What is the recommended repair for OBDII code P0402 on a 1998 Ford F150?
The recommended repair for code P0402 on a 1998 Ford F150 often involves cleaning or replacing the EGR valve, clearing any blockages in the EGR system, and ensuring proper sensor operation.
6. Can I continue driving my 1998 Ford F150 with OBDII code P0402?
It is generally not advisable to continue driving your 1998 Ford F150 with the P0402 code present. Ignoring this issue can lead to reduced engine performance and potentially cause further damage to the vehicle.
7. How much does it typically cost to repair OBDII code P0402 on a 1998 Ford F150?
The cost of repairing the P0402 code on a 1998 Ford F150 can vary depending on the exact cause of the issue. Costs may include parts such as a new EGR valve, labor for diagnostics, and any additional repairs needed.
8. Will resetting the OBDII code P0402 on my 1998 Ford F150 make it go away permanently?
Simply resetting the P0402 code on a 1998 Ford F150 without addressing the underlying issue will not make it go away permanently. It is crucial to diagnose and repair the root cause of the problem to prevent the code from reoccurring.
9. Is it possible to prevent OBDII code P0402 from appearing in my 1998 Ford F150?
Regular maintenance, including cleaning the EGR system and replacing components like the EGR valve as needed, can help prevent code P0402 from appearing in your 1998 Ford F150.
10. Can a malfunctioning EGR temperature sensor cause code P0402 on a 1998 Ford F150?
Yes, a malfunctioning EGR temperature sensor can cause code P0402 on a 1998 Ford F150 by providing incorrect data to the engine control module, leading to excessive EGR flow being detected.
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