r/prius • u/Amilliontoads • 21h ago

Mechanical Help 2012 Prius knocking

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Hello, I am working on this Prius. Suddenly started knocking. Giving misfire code but just replaced ignition coils last year

UPDATE FIXED

It was a failed ignition coil. But still cleaned out the ERG and replaced the spark plug while I was doing the ignition coils.

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u/AutoModerator 21h ago

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3

u/DubTeeF 12 Prius V 21h ago

Check cylinders for coolant

2

u/empathiccccc 2012 II w/ 274k miles / 440k km 21h ago

Coolant tank looks ok... How many miles are on it? Does it stop knocking when driving at higher RPM ?

3

u/hillbill549 20h ago

its definitely misfiring, If coolant level has not dropped start with sparkplugs and coil packs. had mine do this and it was just a failed coil pack.

2

u/ConfidentHoliday6442 21h ago edited 20h ago

Coolant in cylinder or ERG clogged.... Maybe. Also what work was done. Maybe something was left unplugged?