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Engine Oil Change and P0420?

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is normal from the fluid being thrown around.

No issues there.

Roy
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Sunday, March 22nd, 2020 AT 1:13 PM
Tiny
CANNON1349
  • MECHANIC
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Hey in reference to the P0420 above, can that occur due to an evap leak? I had that code and a gross leak evap code. I replaced the purge solenoid and both codes have disappeared, and engine light off but p0420 is now labeled as a historic fault if I scan the system.
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Wednesday, March 25th, 2020 AT 9:48 AM
Tiny
ASEMASTER6371
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No, there is no connection of the codes.

The 420 may be cleared but will come back. It has to fail its own internal test 3 times and light will come back.

Clearing codes does nothing as the issue needs to be addressed.

Roy
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Wednesday, March 25th, 2020 AT 9:50 AM
Tiny
CANNON1349
  • MECHANIC
  • 581 POSTS
I understand that, but I'm used to the p0420 coming back immediately.
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Wednesday, March 25th, 2020 AT 9:52 AM
Tiny
ASEMASTER6371
  • MECHANIC
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It should not comeback right away. It is a 3 trip reset. When you clear it, all it does is make the ECM forget the code.

Roy
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Wednesday, March 25th, 2020 AT 9:54 AM

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