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I'm new to the site so gonna start out saying hello. I'm working on a buddy's atv it's a bone stock 08 trx420fe rancher es. Runs perfect when cold after riding for 40 mins it will die in all gears except reverse idles great and the temp and fi light flashes as it dies. Just wondering were would be a good place to start. I'm new to the fuel injection ATV's and it's been to a few big name shops but it was a new one on them.
Thanks.
 

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gonna go with a bad O2 sensor.
 
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