2zz fault codes PO171 and PO420

Started by mikek, September 25, 2016, 12:23

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mikek

September 25, 2016, 12:23 Last Edit: January 1, 1970, 01:00 by Guest
Im having a couple of issues with my 2ZZ conversion. Apart from the misfire fault codes caused by the stage 2 cams i am also getting the following codes....PO171 running lean bank 1 and PO420 inefficient cat bank 1. I have installed a sports cat and Janspeed exhaust since the conversion but i dont think this would lead to it running lean. Any ideas?

Thanks

Mike
2zz by Rogue. Se7en cams. BMC CDA. Competion clutches lightened flywheel, Megillian Racing Exhaust. TRD sportivo suspension and ARB\'s. TRD braces. TRD quick shift. TRD dash kit, Matts brace. Getting there but not sure when it will stop!

headcase

#1
September 25, 2016, 20:07 Last Edit: January 1, 1970, 01:00 by Guest
clean your maf and space rear lambda sensor out of stream of gases

mikek

#2
September 25, 2016, 20:23 Last Edit: January 1, 1970, 01:00 by Guest
Thanks. I've cleaned the maf. Do I just buy a spacer for the O2 sensors? Do I space both or just post cat?
2zz by Rogue. Se7en cams. BMC CDA. Competion clutches lightened flywheel, Megillian Racing Exhaust. TRD sportivo suspension and ARB\'s. TRD braces. TRD quick shift. TRD dash kit, Matts brace. Getting there but not sure when it will stop!

1979scotte

#3
September 25, 2016, 20:32 Last Edit: January 1, 1970, 01:00 by Guest
First they came for the socialists, and I did not speak out—because I was not a socialist.
Then they came for the Jews, and I did not speak out—because I was not a Jew.
Then they came for me—and there was no one left to speak for me.

Free Ukraine 🇺🇦

Alex Knight

#4
September 26, 2016, 09:48 Last Edit: January 1, 1970, 01:00 by Guest
I've been running a £3 resistor from Maplins to cure P0420 on my 2ZZ. Do a search on here.

The post cat sensor is only there to check cat efficiency, has nothing to do with fuelling. You basically don't need it.

mikek

#5
September 26, 2016, 16:43 Last Edit: January 1, 1970, 01:00 by Guest
Would that solve the running lean issue aswell?
2zz by Rogue. Se7en cams. BMC CDA. Competion clutches lightened flywheel, Megillian Racing Exhaust. TRD sportivo suspension and ARB\'s. TRD braces. TRD quick shift. TRD dash kit, Matts brace. Getting there but not sure when it will stop!

Alex Knight

#6
September 28, 2016, 12:53 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "mikek"Would that solve the running lean issue aswell?
No. They re separate issues.

mikek

#7
September 28, 2016, 18:29 Last Edit: January 1, 1970, 01:00 by Guest
I thought as much. However they appeared at the same time, after I changed the cat and exhaust. Is it therefore running lean because it's shifting more air now the exhaust is free flowing? How do I sort this out?
2zz by Rogue. Se7en cams. BMC CDA. Competion clutches lightened flywheel, Megillian Racing Exhaust. TRD sportivo suspension and ARB\'s. TRD braces. TRD quick shift. TRD dash kit, Matts brace. Getting there but not sure when it will stop!

Alex Knight

#8
September 29, 2016, 11:17 Last Edit: January 1, 1970, 01:00 by Guest
A few things to try are:

Check for exhaust leaks
Clean MAF sensor
Check injector voltages
Replace O2 sensor
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