P0420 code and (Sage) power intake,

[dan]

Hi
i’m driving a Honda civic (2004) Es5(code name) (1.6L) had a head gasket issue and replaced it,all fine now
,but yesterday I got a Chk engine light(P0420) (P0420 Catalyst System Efficiency Below Threshold) , the i erase the error suing my OBD2 scan tool(bluetooth device). so far everything is ok.

According to my scan tool , my air intake temp is around 50-60C (here ambient temp is 30C).
also Manifold pressure is in high side (changes between 80-40 )

o2 sensor voyages r changing rapidly (see the attached pic please78

)

1 )Is there a connection? CAt error ans those 2 high readings?
2) there was a 3rd party power air intake fixed to one of my air lines)
http://car-accessories-lancer691.blogspot.com/2010/05/new-sage-power-air-intake-charger.html

My mechanic removed it few month ago, should I re fix it? :ohmy:

Pls help me.. I’m confused too many things to worry about,

Note : i had a faulty O2 sensor(secondary ) and replaced it with a new one (universal one bought it from Ebay) :dry:

Thank you
Kp

http://i44.tinypic.com/jsiovl.jpg

Attachments:

• es5.jpg

Topic

[Kevin Criswell]

I have found over the years a P0420 is just that, a bad converter. Rarely have I seen it be a case of bad O2s or anything else. I have a feeling that air charge thing is probably a pseudoscience-device, does not probably do much.

Sorry Kp, most likely it is time to replace the converter.

[dan]

ok 🙁 then what about my secondary o2 sensor , shouldn’t it be consistent(voltage ) ?

[Kevin Criswell]

[quote=”Kp” post=81826]ok 🙁 then what about my secondary o2 sensor , shouldn’t it be consistent(voltage ) ?[/quote]

It would be if your converter was working correctly, a dead give away is the secondary tries to match the primary O2s.

Are you in an emissions checking state?

[Author]

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