2021 trailblazer rs check engine light suddenly came on. help.

chevylover

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Mar 11, 2025
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my trailblazer journey had been smooth-sailing for almost 5 years when i encountered the first ever issue: the check engine light suddenly lit.

i was celebrating hitting 30k miles when this happened. i have a hunch its due to the emission control system but im not sure yet. just wanted to check for your thoughts before i head over to the mechanic.

thanks.
 
my trailblazer journey had been smooth-sailing for almost 5 years when i encountered the first ever issue: the check engine light suddenly lit.

i was celebrating hitting 30k miles when this happened. i have a hunch its due to the emission control system but im not sure yet. just wanted to check for your thoughts before i head over to the mechanic.

thanks.
your trailblazer was cruising fine for 5 years check engine light at 30k miles.. not cool to see that party pooper show up! it could be the emission system like you think, maybe a sensor acting weird. i'd say you are smart to check here first but mechanic's your next stop to nail it down..
 
for sure. i was pissed when i saw it, it was like "damn you picked the wrong moment to ruin." thanks for hte input. i scheduled an appointment with my mechanic for tomorrow morning.
 

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