Where is EGR valve pintle position circuit located on my 1996 buick lesabre?

look here https://images.search.yahoo.com/search/images;_ylt=A0geKefTf09cVC0A9whXNyoA;_ylu=X3oDMTE0dTczb2h0BGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjY4ODFfMQRzZWMDcGl2cw--?p=where+is+egr+valve+pintle+position+circut+located+on+my+1996+buick+lesabre+engine&fr2=piv-web&fr=cb-max

If it's the GM engine the fault is on the exhaust gas recirculating system. Get a good mechanic to check it.
Fault code P1406 = EGR Valve Pintle Position Circuit.

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance
Circuit Description
The PCM monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM and to detect a fault if the pintle position sensor and control circuits are open or shorted. If the PCM detects a pintle position signal voltage outside the normal range of the pintle position sensor, or a signal voltage that is not within a tolerance considered acceptable for proper EGR system operation, the PCM will set DTC P1406.
PCM - powertrain control module ,engine computer .
Diagnostic Aids
Check for the following conditions:
• Excessive deposits on EGR valve pintle or seat. Check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.
• Poor connection or damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the EGR actual position display on the scan tool while moving connectors and wiring harnesses related to the EGR valve. A change in the display will indicate the location of the fault.
Important: If the EGR valve shows signs of excessive heat, check the exhaust system for blockage (possibly a plugged catalytic converter) using the Restricted Exhaust System Check.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

CHECK UTUBE

Definition of Diagnostic Trouble Code P1406 Audi: EGR Temperature Sensor Range/Performance BMW: Heated Catalyst Internal Control Module Checksum/ROM Error Buick: EGR Valve Pintle Position Circuit Cadillac: EGR Valve Pintle Position Circuit Chevrolet: EGR Valve Pintle Position Circuit Ford: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged GMC: EGR Valve Pintle Position Circuit Isuzu: EGR Valve Pintle Position Circuit Lincoln: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged Mazda: DPFE Sensor Downstream Hose Off Or Plugged Mercury: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged Oldsmobile: EGR Valve Pintle Position Circuit Pontiac: EGR Valve Pintle Position Circuit Saturn: EGR Valve Pintle Position Circuit Toyota: Turbo Pressure Sensor Range/Performance Problem Volkswagen: EGR Temperature Sensor Range/Performance Volvo: Termperature Warning > 100 degrees C

This code indicates a problem with the EGR valve's pintle position. The EGR Valve's pintle could just be stuck in which case the problem could be fixed by cleaning the EGR valve.

If the EGR valve is electronically controlled or cleaning the valve does not fix the problem, you will most likely have to replace the EGR Valve.

Keep in mind that the EGR valve relies on inputs from other sensors to determine the pintle position. If one of these other sensors is not operating correctly, it could be giving you a false P1406 error code.

P1404 - Exhaust Gas Recirculation (EGR) Closed Position Performance The egr valve is stuck possibly due to carbon buildup. It may be possible to remove the egr valve and clean it with throttle body cleaner or induction cleaner.If the pintle can not be unstuck then the valve egr will probably need replaced.

If the pintle is stuck you should replace the valve.

P1406 - EGR (Exhaust Gas Recirculation) Valve Pintle Position Circuit

You most likely have either a defective EGR position sensor or a peice of carbon holding the EGR pintle valve off it's seat.

The PCM monitors the exhaust gas recirculation (EGR) valve pintle position input to ensure that the valve responds properly to commands from the PCM. When the ignition switch is turned ON, the PCM learns the EGR learned minimum position. The PCM compares the EGR learned minimum position to the EGR position sensor when the EGR valve is commanded closed. If the EGR position sensor indicates that the EGR valve is still open when the PCM is commanding the EGR valve closed, this DTC will set.

Excess deposits on the EGR valve pintle or seat--Remove the EGR valve and check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.

Usually this will fix it but in some cases you may have to replace the egr valve.