SP Sports Exhaust Fitted - Engine Mangement Light Now On.

[garethrees]

Hello,

I've searched around so please forgive me if this is a repost, and point me to the correct search.

Otherwise here is a summary of the issue.

On the weekend I got a SP Sports Exhaust (Full Decat) system put on to my 2002 MR2 Roadster.  

On the day everything was great! a few days later the orange Engine Management light has come on. There is no loss of power or any other clues as to what this may be.

Contacted Matt who fitted the Exhaust and he informed me that this is most likly the 3rd Post Cat O2 sensor and that _my_ car may need a special sensor with a resistor or something.

Now being completly new to this, I've hunted about and no realy found much, but it does make sense since the 3rd O2 sensor is monitoring the cat which is not there anymore.

My question is... can anyone in the same situation as myself make a recommendation as to which O2 sensor I can buy and fit?

Thanks in advance for your help.

Best Regards Gareth

[DannyN]

I think the resistor fix your after will be available at the ROC autumn meet at the weekend

 m http://www.mr2roc.org/phpBB2/viewtopic.php?t=18402 m

[Liz]

If it is a P0141 code then the fix will work.

Welcome to the club BTW - but it is apparent you have been reading alot if not posting!

[roger]

This might also be useful reading. You ought to make sure that the CEL does relate to the 3rd sensor. If its anything else you could be doing damage. You need to get the code read for that.

[spit]

My money would be on you needing an antifouler/O2 conditioner/whatever you wanna call it, but Roger is wise in saying "get the code read".

If you're free on Saturday, bimble over to the meet in Wrexham and we'll have a look for you. Someone will have a code reader handy and someone else may even have a spare antifouler kicking about too?

[garethrees]

Thanks everyone, I'm glad to be here Matt told me that this was the place to come for good advice.

I'd love to come to Wrexham but I'm busy this weekend.  I'll take the MR2 down to my local Toyota who I assume will be able to give me a reading?

If it is a P0141 code then I'll see about getting one from somewhere, is it easy to fit by any chance?

[kanujunkie]

save yourself a few quid and dont go to Mr.T for a code reading as they'll charge you a fortune, especially as its cheaper to buy a reader off ebay

[spit]

Good point Stu - much better you take the plunge and get your own. BUT Don't bother if you're J-Spec MR-S - it won't work

Pending code confirmation of course   s:wink: :wink: s:wink:  :

If its a 3rd O2 heater circuit failure (P0141), replacement or resistor "fix" (grafting a resistor in where the now duff heater circuit is) are both easily DIY'able.

If it requires an antifouler, that too is DIY'able.

Worth getting yourself an O2 sensor removal tool - not essential for the 3rd O2 but always handy to have.

[Anonymous]

If it were me, and presuming you're relatively near SP, I'd be taking the car back to them and get them to fix it rather than doing it myself. You've paid good money for that set-up, so take it back and get them to sort it properly.

[Peter Wright]

If it were me, and presuming you're relatively near SP, I'd be taking the car back to them and get them to fix it rather than doing it myself. You've paid good money for that set-up, so take it back and get them to sort it properly.

too bloody true

[garethrees]

If it were me, and presuming you're relatively near SP, I'd be taking the car back to them and get them to fix it rather than doing it myself. You've paid good money for that set-up, so take it back and get them to sort it properly.

Thanks for that, that was my first thought, but wanted to get some advice first and understand the issues etc. So that I am well informed and know what I'm talking about before I call Matt back.

I don't mind paying for and extra O2 resistor or whatever but I did not really fancy the drive back up to SP for a 10 min job.

So... the CEL reader thingy is it one of these:
Ebay Link

Thanks again everyone! This has been a great learning experience!!

[evileye_wrx]

I got an anti fouler on ebay for about 7 quid. it solved the cel I had from putting in the downpipe, which is presumably the problem if you've just had one fitted.

Of course you should still get it read with an obd2 reader to make sure it isn't something else.

[roger]

So... the CEL reader thingy is it one of these:
Ebay Link

Not quite what mine looks like, but is the thingy.

[Peter Wright]

Why dont you reset the ECU and see if it comes on again it might be the ECU wants to learn the new settings

[Liz]

I got an anti fouler on ebay for about 7 quid. it solved the cel I had from putting in the downpipe, which is presumably the problem if you've just had one fitted.

Of course you should still get it read with an obd2 reader to make sure it isn't something else.

It should come with an anti-fouler - I believe that mine did as SP were aware of this problem..

[evileye_wrx]

SP were aware of this problem..

Perhaps they've forgotten. Or maybe it isn't D/P related after all

[garethrees]

Why dont you reset the ECU and see if it comes on again it might be the ECU wants to learn the new settings

Thanks I will try that, just wanted to get a reading first.  Cheers G

[garethrees]

It should come with an anti-fouler - I believe that mine did as SP were aware of this problem..

I think Matt said something about a spacer or something, which negates the need for an anti-fouler.  But I read somewhere else that the spacer needs to be bigger to cope with a SP system.  Keep you posted. Thanks again for all the adivce. Cheers G

[garethrees]

My Reader is lost in the postal dispute. So I asked MrT who kindly gave me a reading of P0420 Bank 1 or something. Now I just need to google a bit more and look up that code.  s:) s:)

[roger]

http://www.mr2roc.org/phpBB2/viewtopic.php?t=12480

What that is doing is recognising there is no cat. So at least you have nothing else wrong to worry about.

[philster_d]

The damage to o2 sensors seems to always happen when swapping the exhaust. If I were doing the job again, I would remove them very first thing  before any banging of the exhaust pipe etc.

[aaronjb]

The damage to o2 sensors seems to always happen when swapping the exhaust. If I were doing the job again, I would remove them very first thing  before any banging of the exhaust pipe etc.

P0420 isn't damage to the O2 sensor, it's the fact that there is no longer a CAT in the exhaust.. the O2 sensor is almost certainly working just fine - I'd put good money on that.

[dubs]

i had a new exhaust fitted a few weeks back and my engine management light came on straight almost straight away too-it was then diagnosed with a sensor fault but it turned out after further investigation to be that the idiots just hadn't fitted the exhaust properly and that gases escaping out were causing the o2 sensor code to trigger-even though they were working fine.  Your case sounds very similar, my advice to you would be to get that checked out first before you do anything else.  good luck

[philster_d]

Yes I know Aaron I was commenting on the discussions further above.

Just saying take them out before doing the job.   s:) s:)

[garethrees]

Thanks everyone for the advice, Spoken to Matt and he is looking into the problem, when we have a solution I will post an update.  I'm also going to try the reset just in case that works in the mean time.  Thanks again your have all be very helpful.   s:D s:D