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Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Diagnostic Codes: The check engine light is on with a trouble code P1140. 1. Check the right side (passenger side) Intake Valve Timing Control Position (IVTCP) sensor for 12 volts on the Black/White wire. 2. Check the IVTCP sensor for a good ground on the Black wire. 3. Scope the Yellow/Green signal wire and look for a square wave signal of around 8 volts. Check the pattern of the right side sensor and if unsure of the pattern, compare it to the left bank sensor. IVTCP Sensor Wiring — IVTCP sensor wiring/connection. This code is for the right (passenger) bank IVTCP Sensor or sensor circuit. The right and left bank sensors can be swapped from side to side to see if the code will follow the sensor. The sensor is on top of the timing cover. P1140

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REMOVAL PROCEDURE NOTE: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor. Take care when handling the HO2S and the O2S. keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S. 1. Disconnect the electrical connector. 2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle. NOTE: The use of excessive force may damage the threads in the exhaust manifold/pipe. IMPORTANT: If the engine temperature is not above 48° (120° ), the C F oxygen sensor will be difficult to remove. 3. Use the J 39194-B in order to remove the heated oxygen sensor (HO2S). INSTALLATION PROCEDURE NOTE: Refer to Fastener Notice in Service Precautions. A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.

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1. Remove the nuts. 2. Raise and support the vehicle. 3. Disconnect the Catalyst Monitor Sensor (CMS) electrical connectors. 4. Support the exhaust system with a suitable jack stand. 5. Remove the nut. 6. Remove the bolts. 7. Remove the nuts and remove the dual converter Y-pipe. 8. Remove the gaskets and, if necessary, the Catalyst Monitor Sensors (CMS) . Discard the gaskets. 9. To install, reverse the removal procedure.

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ISSUE Some 2003-2006 Expedition and Navigator vehicles equipped with an air suspension may exhibit an air suspension height sensor linkage arm disengaging from the suspension ball stud or height sensor rotating arm. This concern typically occurs with the rear sensor (Figure 1) but may occur with the front sensors as well. If this occurs, the symptom will typically be the vehicle leaning to one side, the vehicle sitting too low/high, a harsh ride, and/or an inoperative air suspension. In addition, this concern may result in diagnostic trouble code (DTC) C1725 (air suspension front pneumatic failure) or C1726 (air suspension rear pneumatic failure). ACTION When a linkage arm becomes disengaged, do not re-attach the arm and do not replace the sensor unless broken. Instead, install a revised linkage arm on all three (3) sensor assemblies, even if they have not detached from the ball stud.Refer to the following Service Procedure. SERVICE PROCEDURE NOTE IF THE SENSOR ASSEMBLY NEEDS TO BE REPLACED FOR ANY DAMAGE/FAILURE OTHER THAN THE ONE DESCRIBED IN THIS TSB, THE REPLACEMENT ASSEMBLY IS SUPPLIED WITH A NEW STYLE LINKAGE ARM, SO THERE IS NO NEED TO ORDER ADDITIONAL LINKAGES FOR THE SERVICE REPAIR. 1. Replace linkage arms on all three (3) sensor assemblies following Workshop Manual (WSM), Section 204-05. 2. Discard the old linkage arms.

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Vehicles with ETS, ESP or ASR have wear sensors for the brake pad wear indicator on the rear axle. There are the following versions: No sensor 2 sensors 4 sensors There are the following versions on the front axle: 2 sensors 4 sensors. When replacing brake pads only install as many sensors as were fitted originally. if only one wear sensor is fitted to a wheel, it is to be fitted to the outer brake pad. Wear sensors which are not connected result in the brake pad wear malfunction indicator lamp coming on due to moisture. NOTE The wear sensor cable must be routed as shown in the illustration. Only the transparent (temperature-resistant) version of the wear sensors may be installed on the rear axle.