OBD II Codes P0128 and P0422?

erik99 · **Joined:** Wed Aug 16, 2006 11:16 am **Posts:** 1

Hey,

My friend's Kia Sportage keeps throwing codes P0128 Coolant temp below regulator temp and P0422 Catalyst Below Threshold (Bank 1).

She says the t-stat has been replaced and it still throws these codes. Could this be the temp sensor instead?

Any help is appreciated,

Erik

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

jeff compton · **Posted:** Wed Aug 16, 2006 4:14 pm

could be a temp sensor issue but still could be a coolant level issue, coolant strength, rad fan problem, etc. I've had lots of problems in the past with those codes using aftermarket parts so It might be worth verifying that the two thermostats openned at the same temp and that the install was in fact done properly

OBD II Codes P0128 and P0422?

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