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Starts then shuts off, codes P0420, P0302 and P0304

Tiny
SOCRAM2021
  • MEMBER
  • 2003 TOYOTA CELICA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160 MILES
My car starts then shuts off quick have codes p0420, p0302, and p0304. Replaced plugs coils and injectors and catalytic converter with same issues. Does anyone have any ideas or suggestions?
Tuesday, March 12th, 2019 AT 5:57 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,592 POSTS
Hello,

None of these codes will make the engine not run. can I ask if the security light is flashing when you try to crank the engine over? If so here is a guide to help reset the system:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
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Thursday, March 14th, 2019 AT 12:45 PM

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