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Service engine check soon

  

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Hi I got this used car a suziki grand vitara 2002 xl7 recently the engine come on is not blinking it just say service engine check soon. While driving the car it didn't wanna drive fast even when it was on 20ml it shake a little bit then the following day light went off n the shake was gone but I get a code p0420 and p0172. I'm not sure what to check since it is my first car.Thank You for any advices or suggestions.


1 Answer
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Follow the troubleshooting here:

https://www.obd-codes.com/p0172

 


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