Ford Explorer Ii P1629 Engine Trouble Code
What is Ford Explorer Ii P1629?
Ford Explorer Ii P1629 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
P1629 on the Ford Explorer Ii
The Ford Explorer Ii is particularly susceptible to P1629 faults when the engine management unit receives conflicting sensor data. Owners report that P1629 on Ford Explorer Ii most commonly surfaces after 60,000 miles, especially when routine service intervals have been missed.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Ford Explorer Ii |
| Brand: | Ford |
| Model: | Explorer Ii |
| Code: | P1629 |
P1629 Ford Explorer Ii Symptoms
Check Engine Light
Illuminated Ford Explorer Ii dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Ford Explorer Ii
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Ford Explorer Ii
Increased Emissions
Failed emissions test due to P1629
P1629 Code Structure
Understanding what each digit means in the P1629 powertrain trouble code:
| P | 1 | 6 | 2 | 9 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Temperature Sensor B Circuit Range/Performance | Turbocharger Boost Sensor A Circuit Low | Reverse Input Circuit |
How to Fix Ford Explorer Ii P1629
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Power steering pressure switch monitors system operation. If pressure changes are not detected after calibrated speed transitions, this DTC sets. Verify PSP switch operation and check for circuit opens or shorts.
Technical Notes:
P1629 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
Ford Explorer Ii P1629 Repair Cost
Ground circuit repairs on the Ford Explorer Ii — a common cause of P1629 — are labour-intensive but parts are cheap. Expect 1.5–2.5 hours of labour ($120–$200) to clean, treat, and re-torque all engine and transmission ground straps. This is excellent value given how often it resolves persistent fault codes.
P1629 Description
P1629 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for P1629 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.
Common P1629 Misdiagnosis on the Ford Explorer Ii
When P1629 triggers on the Ford Explorer Ii, a flashing check-engine light (as opposed to a steady one) indicates an active misfire. Misfire codes are commonly misdiagnosed as sensor faults; always rule out ignition and fuel delivery issues before testing sensors.
DIY Repair Guide: P1629 on Ford Explorer Ii
For Ford Explorer Ii owners without a scan tool, a free diagnostic check is available at most franchised Ford dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of P1629 before committing to any repair.
Preventing P1629 on the Ford Explorer Ii
Keeping the Ford Explorer Ii battery in good health — testing specific gravity annually and replacing at first sign of degradation — protects the ECU voltage supply. Voltage drops during cranking cause sensor reading spikes that can spuriously store P1629.
Frequently Asked Questions — Ford Explorer Ii P1629
A: It depends on the severity. If the check-engine light is steady, it is generally safe to drive to a workshop within the next few days. If the light is flashing, pull over safely as soon as possible — a flashing light indicates an active misfire that can cause expensive catalytic converter damage within minutes.