Question about 1998 Volvo S90

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How do I reset the check engine light on my Volvo S90?

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  • dmccoy03 May 14, 2009

    The code for the engine light was po115

  • ITSCENTER May 11, 2010

    IT HAS TO BE DONE WITH A SCAN TOOL.HAVE U FIX THE PROBLEM THAT CAUSED THE LIGHT TO COME ON?

  • Dave  C
    Dave C May 11, 2010

    You will need an OBD-II scantool. A lot of the auto parts stores will do this for free, but make sure they read the codes and write them down for you. Post back with the codes and and you may get some answers as to why the light came on.

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That code is for the engine coolant temperature sensor. You need to have a look at the connection to it, if it's good, replace the sensor. This is an important engine sensor, they are usually mounted somewhere near the front of the engine in the water jacket, exposed to coolant flow so make sure the engine is cold when you change it.

Posted on May 14, 2009

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You can purchase a low dollar code reader/eraser from your local autozone, VIP or similar parts store. They can be purchased starting at 20 dollars, to 100 dollars.

Posted on May 14, 2009

  • madcams May 14, 2009

    As to the code, dave was right, it was for the coolant temperature sensor. As to where it is located, that is a little different. The 960/s90 engines had 2 different configurations for the ECT, I believe the 960 used a sensor behind the cylinder head. The S90 should have a sensor mounted in the thermostat housing. This is located on the engine side of the top radiator hose. I would URGE doing the thermostat, since its typically the thermostat that causes the code. What the code reader isnt telling you is that the code was set, because the car took too long to warm up. It is a calculated value. So typically we would replace the ECT and the Thermostat all at one time, since they are proximal to one another

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Posted on Jan 02, 2017

emissionwiz
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SOURCE: how do I reset engine light

disconnect the battery for 5 minutes or use a scan tool, the scan tool is prefered method.

Posted on Apr 27, 2009

  • 11 Answers

SOURCE: reset

have to speak to a mechanic or volvo they have to hook up there diagnostic computer and they reset it from there

Posted on May 11, 2009

  • 133 Answers

SOURCE: Check engine light now off - how long before

The OBDII on this model could take up to 2 months to reset. If you are in CA and need to get a smog cert. the state will bypass the OBD check out portion of the inspection. Volvo has a special test drive to reset the system, but nobody that I know has had any success without a road dyno and several hours.

Posted on Mar 02, 2010

afarri
  • 1386 Answers

SOURCE: 2005 volvo the check engine 2005 volvo the check

Hello and welcome to FixYa!
As a first course of action, I strongly suggest that you remove the positive battery connector and let it sit for atleast 10mins. or more before reconnecting it. This will reset the system and can get rid of the dash lights.
If the problem still persists, I suggest that you take it in to a reputable shop to have it resetted manually.
Hope this helps and thank you for using FixYa! Have a good one!

Posted on Aug 07, 2011

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1 Answer

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