P040D-00 EGR temperature sensor

Fault code P040D-00 EGR temperature sensor A- Circuit high indicate problem at exhaust gas temperature sensor. Exhaust gas temperature sensor is use to monitor temperatures of exhaust and send signal to engine control module. Engine control module use this signal from exhaust gas temperature sensor to open or close exhaust gas recirculation flow and also to actuate exhaust gas cooler flow. The sensor is installed between exhaust manifold and intake manifold. Failure of exhaust gas temperatures sensor can lead to late opening and closing of exhaust gas flap and exhaust gas cooler which will effect vehicle mileage. When engine control module receive any irregular signal or faulty signal from exhaust gas temperature sensor than it store fault code P040D-00 EGR temperature sensor A-Circuit high.

Causes of P040D-00 EGR temperature sensor A-Circuit high :

  • Faulty exhaust gas temperature sensor.
  • Damage wiring harness of sensor.
  • Block or carbon deposition on exhaust.
  • Leak at exhaust manifold.

How to trouble shoot :

  • whenever there will be a problem of low mileage in vehicle and check engine light is illuminating on cluster meter. Than it might be possible that there will be a problem of failing exhaust gas temperature sensor.
  • To find out the problem scan vehicle with the help of scan tool, when found fault code P040D-00 EGR temperature sensor A-Circuit high store in engine control module. First take a visible inspection at the place of exhaust gas temperature sensor installed.If found any damage wiring harness or wire stick on exhaust manifold (due excessive heat some time exhaust gas temperature sensor wire get stick with exhaust manifold) than repair that wiring harness.
  • But if there is no damage at wiring harness of sensor than with the help of scan tool check temperature of sensor and also check if temperature of sensor is matching to manufacturer requirements or not. If found that temperature of sensor is not matching according to manufacturer requirement than it means that there is some issue with exhaust gas temperature sensor.
  • Replacing exhaust gas temperature is not a easy process as it is very difficult to remove or installed.

How to replace exhaust gas temperature sensor :

  1. To remove exhaust gas temperature sensor you need a special tool to remove. But if you dont have special tool to remove that sensor than you will need to remove alot of thing which are located above that sensor. Like intake manifold, diesel pipe, vacuum pipe and all the other things.
  2. Than all the other components like diesel filter which is located at the upper portion of body beside sock ups mounting. Remove all the pipe of diesel main line and return line. All area should be clear before going to touch exhaust gas temperature sensor.
  • After all the upper accessories removal. Remove the two metal plate around exhaust temperature sensor. That two metal plate is not easy to remove as there lower side bolts are not accessible to remove.
  • After removing that two metal plate spray rust removing liquid on sensor as sensor get stuck very hard in exhaust manifold due excessive heat. That’s why spray rust free liquid on sensor and wait for some time.
  • After sometime with th help of special tool remove exhaust gas temperature sensor carefully. Try not to break exhaust gas temperature sensor at exhaust manifold as if you break that sensor at manifold than it will be very costly and very hard to remove that break sensor from exhaust manifold. Because to remove that break sensor from exhaust manifold you will need to remove whole exhaust manifold.
  • Removing complete exhaust manifold is not a easy task, as it is very difficult work to do. Because when will go to remove exhaust manifold you will have to remove all the other things located below exhaust manifold. Like complete turbocharge assembly, and all intake pipe which are connected with turbocharger. After that you will see that exhaust manifold is not able to remove.
  • After removing exhaust manifold that broke exhaust gas temperature sensor can be remove with the help of an expert who is well experienced in his work.

Symptoms :

  • Symptoms may be very few as there is no any measure issue happen with vehicle when exhaust gas temperature sensor fail except low mileage problem.
  • Fault code will store in engine control module.
  • Check engine light will illuminate on cluster meter.
  • Some time low pickup issue can be feel.

Solution of P040D-00 EGR temperature sensor A-Circuit high :

  • Replace faulty exhaust gas temperature sensor.
  • Repair damage wiring harness.
  • Clean carbon deposition at exhaust manifold.
  • Repair leak area at exhaust manifold.

Procedure to remove exhaust gas temperature sensor is given below:

Egr temperature sensor

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