Toyota diagnostic help.

"Pixel" (Improbcat) 10/01/2015 at 09:49 • Filed to: None

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I thought that after the !!!error: Indecipherable SUB-paragraph formatting!!! the problems with my partner’s Prizm would be over.

Since then however it has been throwing code p0125, which in toyota is oxygen-sensor related and means the engine never goes into closed-loop operation. The oxygen sensor is on order and should be here tomorrow or Sat.

However since Monday it has been throwing code P0304, and the #4 coil has failed twice(once on tues, I !!!error: Indecipherable SUB-paragraph formatting!!! , and that has since failed).

I found one passing reference that if the engine doesn’t go into closed loop operation it stays in “start” mode and provides extra power to the coils, which may be causing the coil problem. I’m hoping this is the case, because the O2 sensor will solve my problems, but am looking for any other thoughts/ideas as I’m reaching the end of my wits with this thing.

crowmolly > Pixel 10/01/2015 at 10:19

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Pixel,

Looks to me that P0125 is your coolant temp sensor. Where did you get O2 from that?

Pixel > crowmolly 10/01/2015 at 11:14

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Several sites online note that for toyotas P0125 is related to the front o2 sensor.

The most detailed one I can find .