2012 Prius - CEL P0301 Cylinder 1 misfire/Engine knocking

3 years ago
98

My attempt at diagnosing and fixing my engine problems (amateur):

What I did to fix my issue when I got a check engine light with a P0301 code indicating a misfire in cylinder 1 with severe engine knocking.

For the last 4-5 months my car has been blowing mostly warm air, even on cold days and my car temp set to 65 degrees. To get any cold air at all I would have to turn on the AC. After this maintenance the cold air has returned and everything is back to normal.

I used the following videos from NutzAboutBoltz as a guide:

Sparkplug replacement:
https://www.youtube.com/watch?v=mwUnPkQ94OE

EGR maintenance:
https://www.youtube.com/watch?v=2_Hr2tAK7-c

Intake manifold maintenance:
https://www.youtube.com/watch?v=579M-4wPSUI

Some good clamps you can order: https://www.amazon.com/ARES-71160-3-Piece-Lightweight-Repairing/dp/B071DPKQ17/ref=sr_1_1?keywords=ARES+71160&qid=1563695484&s=gateway&sr=8-1

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