emissions

Call the midlife! · March 24, 2018, 20:27

Quote from: shnazzle on March 24, 2018, 20:25
Duff o2 can most certainly make you fail MOT. Easily.

High HC is running rich (or stupid lean), if o2 sensor is reading lean incorrectly, it will be telling the ecu to dump fuel in,making it run rich as hell and give you insane hc levels like 800+

Every day's a school day, I did say I wasn't an expert [emoji23][emoji23]

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davethediscoman · March 24, 2018, 20:40

hc levels 876ppm

shnazzle · March 24, 2018, 20:47

Load up ye olde Torque next time and watch the fuel trims. I'm guessing it'll be in decently high positive figures

davethediscoman · March 27, 2018, 16:06

Hi does anyone know what fuse bank one sensor one is in fuse box?

Call the midlife! · March 27, 2018, 17:41

Quote from: davethediscoman on March 27, 2018, 16:06
Hi does anyone know what fuse bank one sensor one is in fuse box?

Looking in the handbook it doesn't quote O2 sensors so you might have to find out what they DO call them as they have fancy names for stuff like high idle control etc.

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davethediscoman · March 27, 2018, 17:58

Yes I have been looking as you say probably the only way is looking at every fuse.

Call the midlife! · March 27, 2018, 18:20

Quote from: davethediscoman on March 27, 2018, 17:58
Yes I have been looking as you say probably the only way is looking at every fuse.

Looking at some wiring diagrams I don't really understand they lead me to fuse 44. EF12 (or I2) 7.5A

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shnazzle · March 27, 2018, 18:45

Quote from: Call the midlife! on March 27, 2018, 18:20
Quote from: davethediscoman on March 27, 2018, 17:58
Yes I have been looking as you say probably the only way is looking at every fuse.
Looking at some wiring diagrams I don't really understand they lead me to fuse 44. EF12 (or I2) 7.5A

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They don't have their own fuses. It's fused into the fuel injection wiring as a whole. EFI1 and EFI2

BahnStormer · March 27, 2018, 22:08

My 2007 on 60k miles just failed emissions across the board - the guy at the test station said given how badly it failed across the board - probably O2 sensor ("but possibly cat"):

Fast Idle:
CO 7.165% (max = 0.2%)
HC 812ppm (max = 200ppm)
Lamda 0.780 (min = 0.97)

Fast Idle #2:
CO 7.376%
HC 788
Lamda 0.776

Natural Idle 5.108% (max 0.3%)

Wasn't even close on anything... and I've never seen this as an MOT fail / advisory in the history.

Apparently it has an aftermarket cat - so I'm hoping that is new and not a problem... but there is a thought that the previous owner may have done a stealth decat?!?! (I've heard of straight pipes, but would people make it look like it had a cat, but just clear it out?)

It doesn't burn or use any oil, so I'm hoping that means this is purely sensor related... I'll have a look at ODB2 stats this weekend.

1979scotte · March 27, 2018, 23:00

If it's a 200 or even worse a 100 cell sports cat they need to be hot hot hot to pass MOT.
Proper thrashing required.

shnazzle · March 27, 2018, 23:26

There's absolutely no benefit in gutting a cat on a petrol as the emissions readings tell the tale (as you well know). So it's either a o2, your cat is knacked, or it's a 100 for 200 cell. This only works on diesels while they do visual inspections for presence of the dpf

If 100...put a bottle of Catclean through, make sure it has fresh oil, plugs and air filter. Then rag the living bejesus out of it for a good while until even the stock is exhaust burbles. Then do donuts on the forecourt while waiting for the MOT, and then you might pass

Then save up for a 200 or 400 cell replacement.

If 200, just make sure it's good and hot. Few good full-throttle blasts.

BahnStormer · March 28, 2018, 08:53

thanks - might try the catlclean route - not sure what the cat spec is, only that MikeK and Andibell saw it and comments that it looked a lot smaller than stock...

Joesson · March 28, 2018, 09:16

Noticed Scotte is liking the donuts

Call the midlife! · March 28, 2018, 09:38

Quote from: Joesson on March 28, 2018, 09:16
Noticed Scotte is liking the donuts

Bit harsh, I'm sure all the new horses (and torques) will be able to cope with however many he eats...

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mikek · March 28, 2018, 14:03

Quote from: BahnStormer on March 28, 2018, 08:53
thanks - might try the catlclean route - not sure what the cat spec is, only that MikeK and Andibell saw it and comments that it looked a lot smaller than stock...

Wasn't stock, looked like a cats 2 u replacement to me. Also looked like it had been on there a while.

Carolyn · March 28, 2018, 14:48

Hi HC won't be cured by cat....

sounds like a combination of things - possibly O2 sensors and cat....

BahnStormer · March 28, 2018, 20:03

Ok - I got a bottle of Cataclean, to see if that makes any difference.

1) How many miles does that require to start having an effect?
2) From Carolyn's comment, it sounds like it'll be O2 sensors too? Any suggestions on how best to diagnose and/or fix O2 sensor issues?

I'm assuming this requires OBD2 port scan? I've got a cable, but I've just had a look and it is the Rosstech one from my Audi and I think that they do VAG cars only. IIRC the license for the software is embedded in the cable, but do I just re-install the same RossTech software that I used on my Audi and start hunting for an ODB2 port?!? I think I've got little handheld box for error code reading too, but that may be a bit tricky to find!!

shnazzle · March 28, 2018, 20:05

Quote from: BahnStormer on March 28, 2018, 20:03
Ok - I got a bottle of Cataclean, to see if that makes any difference.

1) How many miles does that require to start having an effect?
2) From Carolyn's comment, it sounds like it'll be O2 sensors too? Any suggestions on how best to diagnose and/or fix O2 sensor issues?

I'm assuming this requires OBD2 port scan? I've got a cable, but I've just had a look and it is the Rosstech one from my Audi and I think that they do VAG cars only. IIRC the license for the software is embedded in the cable, but do I just re-install the same RossTech software that I used on my Audi and start hunting for an ODB2 port?!? I think I've got little handheld box for error code reading too, but that may be a bit tricky to find!!

You've got vcds?

Nice!
Unfortunately it won't help you on the Toyota. Only VAG.

Someone near you might have an obd2 scanner. Have a look at the members map to see who is near you and ask.

1979scotte · March 28, 2018, 20:55

Buy a Bluetooth odb2 dongle for less than a fiver download torque for Android Bob is your mother's brother.

BahnStormer · March 28, 2018, 22:40

Quote from: shnazzle on March 28, 2018, 20:05
You've got vcds? Nice!

yeah - happy to lend a hand with VAG diags - VAG electronics are one area I'm actually reasonably comfortable with - lots of custom coding on my old (B6) A4 (reverse mirror, cruise control, satnav) as well as diagnosing and swapping all the microswitches (brake+clutch) when my retrofit cruisecontrol stopped working after 2yrs... paid for the RossTech with that one alone!!

Quote from: shnazzle on March 28, 2018, 20:05
Unfortunately [VCDS] won't help you on the Toyota. Only VAG.
Someone near you might have an obd2 scanner. Have a look at the members map to see who is near you and ask.

No stress there, I used to be really into this on my old VAG cars: but I've also got an old Star Trek style "communicator" (port scanner)... it'll only read / reset codes, but that'll be enough for this.... then I got a USB-OBD2 dongle to try to write some codes for my old Audi A4 (B6) and realised that it would be 100x easier with VCDS, so I bought that.... the VCDS is in the Audi, but the old kit is in my shed and that is a mess - I slid the hardtop in there after I got the new roof, so I need to move the hardtop out the way, but I think I can get to the box and dig out the old USB-OBD2 cable and reader (IF that still works from about 8 yrs ago!!)... hopefully I'll be okay.

BahnStormer · March 28, 2018, 22:43

Quote from: 1979scotte on March 28, 2018, 20:55
Buy a Bluetooth odb2 dongle for less than a fiver download torque for Android Bob is your mother's brother.

I think I'm fine on that: Should still have the ODB2-USB cable.... and I've got USB-C and USB-micro OTG cables for my tablet and phone, so that'll be my backup plan if the code reader is bvggr3d (likely after about 8yrs!).... but thanks for the Torque app advice!

edit: and thanks/apologies to DaveTheDiscoMan for the thread/hijack... it seemed too close to what I needed to ask to start a new thread!

BahnStormer · March 29, 2018, 07:23

Update: I've had a dig around the shed thismorning - I can't find the USB-OBD2 cable anywhere and I've just realised that my generic scanner probably isn't generic: MemoScan VAG5053... I've had a look and it seems to be focussed on VAG CANBUS cars only (changes forum status to "Member has OBD2 scanner = NO")

BahnStormer · March 29, 2018, 13:12

Bluetooth OBD2 on order! (will change OBD2 status once I have this confrmed as working!). Due to arrive tomorrow (good old Amazon!).

How easy is the O2 sensor to fix once I know which one it is? Is it worth doing all three now? And do people have any tips in addition to this guide (10yrs old) https://midshiprunabout.org/mk3/replacing-o2-sensors/

And recommendations on where to buy? https://www.mr2-ben.co.uk/?utf8=%E2%9C%93&query=02+sensor ?

If it is also a cat problem, what are the best options for replacement? 200 / 400 cell Sports cat? Or am I best staying away from sports cats as they need more heat to operate properly? I don't tend to rag it THAT heavilly (only 20mins at a time), all I want something that is going to allow as much flow as possible, but also gives me the best chance of passing emissions every year.... thanks for the top tip Scottie, but my local MOT stations all have very small parking areas, so no room to do donuts while I wait to go in....

1979scotte · March 29, 2018, 13:19

My opinion.
Don't bother with a sports cat 400 cel stock type will do. This is even more true if there is no car park room for donuts.
I usually book mine for a first thing Saturday and go for anreally good drive early doors. Or get my mechanic to do it.
02 sensor try Amazon sparkplugs.co.uk or Opie oils. Stick to DENSO.
Don't do all 3 some people have to change quite a few I've never done one in 4 years. Think you need a special socket to change them. Perhaps it's the same as a sparkplug.

shnazzle · March 29, 2018, 13:23

O2 sensors (Denso original only) are fairly priced on sparkplugs.co.uk (I know, seems weird but roll with it), or ebay DOX-0204 or DOX-0206 depending on which one had gone.

Use the OBD2 adapter to get the error code and it will tell you which sensor it is, or multiple sensors.

Stick with a stock cat. No need for a sports cat for your use. 120 gets you one on ebay. Not stock quality but it'll get the job done.

Changing the o2 sensor can be very easy indeed if they're not stuck, and it's not the post-cat one.

Figure out which one it is and go from there