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I have a 2018 Colorado that had the ecm update done the dealer said the particulate sensor is bad does anyone know where this sensor is located they wanted $550 to replace I was able to get the sensor for 130 just not sure where it is

thanks
 

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The PM sensor is last. Where exhaust shoots over rear axle. Cant miss it.

If you are referring to the DPF pressure sensor... Follow the rubber hoses from the dpf. There are 2.
 

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Have a look at this thread. First post, fourth photo. And welcome to the forum.

 
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2018 Colorado ZR2
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Any of you happen to know if all the emissions stuff is on one harness? I am doing a lot of wiring and don't want to mess with it. Bonus points for a schematic with that stuff in it.
 
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