Cleared p0171, p0135, and p0141 only to reach the final boss: p0420 - Toyota Celica Forum
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post #1 of 3 (permalink) Old 11-28-2018, 06:08 PM Thread Starter
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Default Cleared p0171, p0135, and p0141 only to reach the final boss: p0420

Bought a 2001 Celica GT a few months back. Need it smogged before I get it impounded. (Approaching 6th months overdue)

Upon purchase it was sporting the p0171 and actually the p0420 as well.

Been trying things on and off. Apparently the p0135 and p0141 were caused by two hoses that were on the incorrect nipple... Valve... Whatever. Switched them around and the coded went away. Repaired a plug for the EVAP and switched from 87 fuel to 89, the p0171 hasn't come back as of yet.

Thought I was in the clear until BAM. -- stupid p0420 code standing there, menacingly. 6

I also can't seem to get the EVAP or CAT Mon. to hit "ready" but i haven't tried to complete any drive cycles yet, either lmao.

Injen CAI.

..Small amounts of oil on 2 spark plugs and coming from leaky head gasket!

Just really wanna get this done before i lose my car
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post #2 of 3 (permalink) Old 11-28-2018, 06:18 PM Thread Starter
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Should also note that the p0420 code isn't illuminating the CEL.
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post #3 of 3 (permalink) Old 04-18-2019, 10:36 PM
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Screw in an extension to the second O2 sensor behind the CAT. That should fix P0420 for good.

The EVAP CEL is waived, not required for passing SMOG test, even though the CEL will stay on. EVAP may be caused by leaky hoses or an old Charcoal canister on top of the fuel Tank, abotu $100 used.

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Originally Posted by coughie View Post
Should also note that the p0420 code isn't illuminating the CEL.
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