Question about Chrysler 300

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How do you check an EGR position sensor and a O2 sensor to see if they actually need to be replaced or not? I was advised by one of the experts to check them but was not told how to check them in this 2005 Chrysler 300 with 3.5 Liter engine. Lou

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  • loustoy235 Jul 12, 2010

    yes thanks

  • Anonymous Mar 11, 2014

    engine identification number 9969852

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Hi,

I think you mean a crankshaft or camshaft position sensor.

Crankshaft position sensor can be checked with an ohmeter, check for these 3 things.
1. 5 Volt supply to terminal 1 which is looking at it from the front and the clip on top.
2. Check for earth on the middle terminal.
3. Ceck for signal from ECU or CKP which will fluctuate between .05 - 1.25 volts on terminal 3.

Crankshaft position sensor is on the left hand rear of the engine looking at it from the front.

Camshaft sensor should really be checked with a ossiclliscope but you can check the voltage and grounds etc the same as the crankshaft sensor.
This can be found at the front of the engine.

The O2 sensors there are 2 of them one on each sdie, in the exhaust system.
These have 4 terminals and when you are looking at them from end on at the connector they are numbered 1 - 4 from top left to bottom right.

1. Should be ground
2. Should be heater control to ECU
3. Return signal from ECU
4. Out put signal.

All the other O2 sensor signals are the same.

I hope this helps, let me know if you need more information

Thanks

Jason

Posted on Jul 09, 2010

  • loustoy235 Jul 09, 2010

    My code PO406 is a EGR Position Sensor circuit high not a Crankshaft Position Sensor. I was told by another expert to check the EGR and O2 sensors or replace them... Wanted to check them first before doing the costly replacement to see if they actually needed replaced or not. He never told me how to check them. Please tell me how to check the EGR and O2 senors if you know a good way to do this. This is for a 2005 Chrysler 300. It has a 3.5 Liter engine.

    Thank You,

    Lou

  • Jason Maurirere
    Jason Maurirere Jul 12, 2010

    Ok to check the EGR sensor you need a DRB III hand diagnostic tool.



    Are you able to get one of these, according to the manual this is the only way that this can be tested.



    You need to check the Voltage input and output which should not be more then 4.5 volts.



    Let me know and I can give you more information.

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  • There is a blockage in the EGR (tube), most likely carbon buildup
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Possible Solutions In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
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Causes A code P0136 may mean that one or more of the following has happened:
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MIL on


Actually the PO139 is Downstream O2 sensor slow to respond, And PO400 is EGR flow malfunction. But any why it sounds like the problem is in the exhaust system. I would start by checking the EGR valve first. Make sure the vacuum is operating it properly. If it is not that would make the O2 sensor slow to read or give the emissions system problems with oxygen readings. Good luck and have a good day.

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Hi

If the engine is running without any problems then The fault code which has flagged the checked engine light will either pertain to the upstream O2 sensor, a drop in catalytic efficiency, an EGR issue, or maybe even an EVAP issue.

A lot of EVAP issues can be resolved by simply ensuring that the fuel filler cap is on securely, otherwise a vacuum leak will be detected in the system and the check engine light will come on.

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Have a code read done and then have the codes reset and see what comes up.

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