1990 740 GLE Fault Code 4-1-3 Still Pops Up
 

Hi, I have a 1990 740 GLE 16-valve sedan. I replaced both the EGR Valve and the EGR Temperature Sensor with new parts after receiving the 4-1-3 fault code. [EGR temperature sensor signal missing or faulty.] Not an easy job and required the removal of the intake manifold just to get to the EGR Valve. After replacement the Volvo runs fine but the 4-1-3 Fault Code still pops up rather quickly after starting the car. I need to get the fault code to stop so that I can pass the mandatory smog check.
Does anyone know of something that I am missing or something else to check? Is there a fix or solution without removing the intake manifold again?
Any and all help would be appreciated.
Thanks.

the EGR pipe is probably plugged up with soot at the end thats connected to the intake manifold. your valve and sensor were probably fine the whole time.

Thanks for the input, however, when I had the EGR Valve off the car I removed the pipe that wraps around the back of the motor to the exhaust manifold and cleaned it. It only had very minimal carbon buildup. The pipe that connects from the ERG Valve to the intake manifold was also clear of carbon buildup.
My 740 GLE is a 1990 with about 212,000 miles on it.
Brief history: Its had a valve jobs (yes all 16 valves) after the timing belt broke. I have removed the lower timing belt that used to operate the two lower balancing shafts (who's idea created those things?). Dealer purchased replaced ECU. Rebuilt transmission. Changed most wear or burn out parts like fuel pump, fuel filter, alternator, starter motor, coil and plug wires, crankshaft position sensor, radiator, mufflers and cats. Also cleaned out the throttle body.
This persistent 4-1-3 code is baffling.
Any other thoughts out there?

How do you know it will not pass inspection. Did you already fail. I would be surprised if anyone would check codes unless you have a check engine light. I had my 89 740 inspected last in NY and the car is to old to do any smog test. Now days if it doesn't have an OBDII connector it doesn't get checked.

The check engine light on the dash board goes on after starting the engine. I'll clear the code, restart and the the check engine will come back several seconds later.

California requires biannual tests on all cars made after 1975, and they are quite strict. EGR valves were a California-only thing initially.