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Code P0134

Old 09 January 2019, 07:23 PM
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Default Code P0134

I know itís coming up as O2 sensor but all was fine until 3 things. Radiator split, changed air filter (for stock replacing dirty) and filled up with Tesco momentum.
Im wondering if either the car doesnít like momentum (added a octain booster to see if it help and it hasnít)
Changing the air filter I Knocked the wiring perhaps
or itís compete chance and the O2 has failed.

Itís a jdm 2005 hawk that Iíve had no issues with until the above.
cleared the code but it returns.
should I fill with v power, change fuel filter and see what happens or is it only going to be a failed sensor.

do I really need to take the wheel inner plastics out?
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Old 09 January 2019, 09:10 PM
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Don Clark
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DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)

This refers to the A/F sensor and maybe just a blown fuse, damaged wiring or dead sensor.

As it's a twinscroll, AFAIK, the A/F sensor is in the top of the down pipe after the turbo with the O2 sensor just before the donut joint.
So no need to go looking in the offside wheel well for the access flap to the manifold as with the single scroll turbo models.


Part number for Rev E or F model 22641AA191

ICP price £295 inc VAT
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Old 09 January 2019, 09:22 PM
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Originally Posted by Don Clark View Post
DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)

This refers to the A/F sensor and maybe just a blown fuse, damaged wiring or dead sensor.

As it's a twinscroll, AFAIK, the A/F sensor is in the top of the down pipe after the turbo with the O2 sensor just before the donut joint.
So no need to go looking in the offside wheel well for the access flap to the manifold as with the single scroll turbo models.


Part number for Rev E or F model 22641AA191

ICP price £295 inc VAT
thanks Don,
I assume the fuse is inside the sensor? Iím hoping that messing with the air box agetated the loom or something.
it has an aftermarket alarm with a large black pressure switch behind the air box.
is the o2 easy to see from the engine bay?
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Old 09 January 2019, 10:23 PM
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Originally Posted by RobsyUK View Post
thanks Don,
I assume the fuse is inside the sensor? I’m hoping that messing with the air box agetated the loom or something.
it has an aftermarket alarm with a large black pressure switch behind the air box.
is the o2 easy to see from the engine bay?
Fuse maybe a red herring as it would only apply to the heater circuit and not the sensor side.
The A/F sensor will be on the inboard side of the down pipe as shown top right of this picture (black cable)


Probably need to remove intercooler to get to it.

Last edited by Don Clark; 09 January 2019 at 10:25 PM.
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Old 09 January 2019, 11:52 PM
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Rob, I had this issue with my JDM, same code. Although every case is different it was the sensor that was faulty and needed replacing.

Indeed you do need to remove the intercooler to change the sensor. Just make sure you buy the genuine sensor not a cheap copy such as a Denso etc. Iím reliably informed it must be the real deal.

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Old 10 January 2019, 11:41 AM
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Originally Posted by Binny View Post
Rob, I had this issue with my JDM, same code. Although every case is different it was the sensor that was faulty and needed replacing.

Indeed you do need to remove the intercooler to change the sensor. Just make sure you buy the genuine sensor not a cheap copy such as a Denso etc. Iím reliably informed it must be the real deal.

Binny
Denso are one of the best brands to be honest, I could be wrong but I think they make the OEM sensors. I've always been advised to buy Denso sensors and nothing else by other Subaru specialists.
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Old 10 January 2019, 08:27 PM
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Originally Posted by BrownPantsRacing View Post
Denso are one of the best brands to be honest, I could be wrong but I think they make the OEM sensors. I've always been advised to buy Denso sensors and nothing else by other Subaru specialists.
Hi BrownPants

I could be wrong with the brand in that case but I was specifically advised to buy the genuine article when mine when wrong by my tuner and that seems very apparent when searching the forum for similar instances. If Denso was the proper thing then Denso it is, just get the genuine article.
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Old 10 January 2019, 08:31 PM
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Iím suprised no one since 2005 has found a uk alternative (maybe they did) but according to Denso the following will work:

Hi Rob,

According to our e-catalogue the DOX-0306 Aftermarket part number would be the right fit for your car.

Where in the UK are you located so I can look up the closest DENSO distributor in your area.

Kind regards
Daniel
DENSO Aftermarket Europe


The question is... whoís brave enough to try it.

Weirdly I checked my fuses and made no change. Touched all the wires and it made no change. Went to the local shop and the light didnít come on!. Went for a blast and it still didnít come on..
maybe itís fixed?
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Old 10 January 2019, 08:34 PM
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Originally Posted by Binny View Post


Hi BrownPants

I could be wrong with the brand in that case but I was specifically advised to buy the genuine article when mine when wrong by my tuner and that seems very apparent when searching the forum for similar instances. If Denso was the proper thing then Denso it is, just get the genuine article.
From another thread on the subject - OEM item is Denso


https://www.scoobynet.com/engine-man...2641aa191.html

Last edited by Don Clark; 10 January 2019 at 08:39 PM.
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Old 10 January 2019, 09:02 PM
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182.81 sterling from amayama.com
you May or May not pay custom charge
I got a few front 02 sensors from there myself
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Old 10 January 2019, 09:16 PM
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Originally Posted by RAGGY DOO View Post
182.81 sterling from amayama.com
you May or May not pay custom charge
I got a few front 02 sensors from there myself
already ordered 👍
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Old 10 January 2019, 09:20 PM
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Good lad
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Old 10 January 2019, 09:21 PM
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Thought it was, thanks "King of the Parts"
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Old 10 January 2019, 09:22 PM
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I bought my genuine Denso front lambda from Sparkplugs.co.uk and it was under £100 delivered or around that figure somewhere.
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Old 10 January 2019, 09:24 PM
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Don is a feckin national treasure
or in my case an international treasure
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Old 11 January 2019, 07:40 PM
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Agreed, hereís my old one and itís a Denso (sigh). Sorry lads, didnít mean to miss inform.



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Old 13 January 2019, 06:39 AM
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Ordered from Amayama.
Id rather pay £220 and chance import tax then £330 and wait the same time.

Iím going to go to Japan and bring loads back.
when customs ask what they are Iíll say they are Christmas lights or something 😂
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Old 13 January 2019, 07:51 AM
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Originally Posted by RobsyUK View Post
Ordered from Amayama.
Id rather pay £220 and chance import tax then £330 and wait the same time.

Iím going to go to Japan and bring loads back.
when customs ask what they are Iíll say they are Christmas lights or something 😂
put me down for one when bringing them back from japan and a s203 gear surround while your there please
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Old 13 January 2019, 09:35 AM
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Originally Posted by RobsyUK View Post
Ordered from Amayama.
Id rather pay £220 and chance import tax then £330 and wait the same time.

Iím going to go to Japan and bring loads back.
when customs ask what they are Iíll say they are Christmas lights or something 😂


I never paid tax on 3 items I ordered from there
always seem to get stung from the Stuff from the states
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