prov3rbz@alien.topB to Mechanic Advice@gearhead.townEnglish · 11 months ago

2018 Hyundai elantra 2.0

prov3rbz@alien.topB to Mechanic Advice@gearhead.townEnglish · 11 months ago

Question…

I only have 2 Oxygen Sensors in this vehicle. One Upstream and one Downstream.

If I were to change the Upstream should I change the Downstream as well??

Why I’m changing my upstream you ask??

I am seeing noticeable affects off the vehicle running rich. Too much gas consumption than normal

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Embarrassed-Top-2258@alien.topB
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11 months ago
You don’t need to change the downstream at the same time. I think the downstream mainly measures catalyst efficiency. And the up stream is air fuel?

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