EML codes P1146 & P1166 intermittent

[MattyV6]

Hi all,

 

Ever since owning my 350Z (3 years now) I've had the EML come on intermittently, say once every 3-6 months, always with the same codes;

 

P1146

P1147

P1166

P1167

 

These all point to O2 sensors from what I can find but I'm not sure which ones as the 350Z has 2 on each bank.

 

The car itself has some engine mods - Popcharger, Plenum spacer, Berk HFCs, Nismo S-tune exhaust and UpRev. It's a 2004 with 110k miles (had 80k when I bought it). Has failed MOT on emissions a couple times - assumed this was because of HFCs but now not so sure.

 

Is this normal behaviour for a 350Z with HFC and other engine mods? Or should I look to be replacing the O2 sensors, and if so which ones??

 

Thanks in advance for any help and advice

 

Matty

Edited February 11, 2015 by MattyV6

[M13KYF]

I'm not sure you saying you have a friend who friggs your MOT on a public forum is wise

[ZMANALEX]

The codes relate to the rear cat sensors so your issue is normal, however you should have just got them permanently turned off when you got the UpRev.

[MattyV6]

Thanks Zman, unfortunately the UpRev was before my ownership As long as I'm not causing issues just resetting them I'm not worried. Car drives perfect with no running issues even with the light on.