early facelift 986s failing mot due to lamda!
Discussion
Took my jan 03 facelift S in for its first MOT today (due early jan).........After a while the guy comes back (they also do OPC's mot's for them as the local one doesnt do them onsite) and tells me despite trying everything, they couldnt get it to pass on the lamda, this was the 2nd 52 boxster they'd seen that day that had failed on the same problem, and one of many that week......The only way I've been told opc has got these failiures through is to replace the lambda sensors........all 4 of them............
Looks like theres trouble brewing potentially for Porsche, Luckily I've extended the warranty, I'm hoping this covers it...........Any ideas?
And from the level of faults that MOT stations are seeing on this, its too much of a coincidence to be wear and tear............must be a duff batch maybe?
Anyone else had a facelift 52 fail its mot on this point? I understand the test centre had seen a large number of 52 / jan 03 boxsters that week, all had failed.
Looks like theres trouble brewing potentially for Porsche, Luckily I've extended the warranty, I'm hoping this covers it...........Any ideas?
And from the level of faults that MOT stations are seeing on this, its too much of a coincidence to be wear and tear............must be a duff batch maybe?
Anyone else had a facelift 52 fail its mot on this point? I understand the test centre had seen a large number of 52 / jan 03 boxsters that week, all had failed.
Spoke to the tester at length, they tried taking the last failiure up the road for about 20 miles at motorway speeds to warm up the engine, even tried warming the engine on mine via idling and some gentle revving to no avail......
Got the used opc warranty, so hopefully that will cover this..........Theres 4 sensors! I'm guessing a fair few quid? anyone any experience?
Got the used opc warranty, so hopefully that will cover this..........Theres 4 sensors! I'm guessing a fair few quid? anyone any experience?
remoh said:
Spoke to the tester at length, they tried taking the last failiure up the road for about 20 miles at motorway speeds to warm up the engine, even tried warming the engine on mine via idling and some gentle revving to no avail......
Got the used opc warranty, so hopefully that will cover this..........Theres 4 sensors! I'm guessing a fair few quid? anyone any experience?
Had to do one on my Noble and the part wasn't exactly cheap. I can't see how all 4 would be broken though. Then again maybe testing them is too expensive to be worth while.
Its more likely to be a mass air flow sensor fault. one sensor failing or four sensors all failing together. The end result is the same.
If it is the maf, this has more serious implications that the O2 sensors. Either way, they will be covered under the OPC warranty.
The gas in the exhaust will be around 300degC on idle and 600+degC on cruise. Outside air temps won't affect this. O2 sensors need to be working in under a minute for the car to pass the most recent new vehicle emissions regs.
If it is the maf, this has more serious implications that the O2 sensors. Either way, they will be covered under the OPC warranty.
The gas in the exhaust will be around 300degC on idle and 600+degC on cruise. Outside air temps won't affect this. O2 sensors need to be working in under a minute for the car to pass the most recent new vehicle emissions regs.
Hatfield are on the case, spoke to a guy from there today, very helpful chap, they've had a few issues with cars of the same age etc, and have got a plan to swap out a couple of the sensors (cant remember if its pre or post cat) and retest one of the failiures, and various variants of this.....
Sensors i've been told are covered by the warranty and to be honest, I'd be over them like a bad rash if it wasnt......
So lets see, opc are going to update me tomorrow on their findings..
Sensors i've been told are covered by the warranty and to be honest, I'd be over them like a bad rash if it wasnt......
So lets see, opc are going to update me tomorrow on their findings..
Can you tell us exactly what reading it failed on.
There are three possibles.
Did it fail on Lamda too high/low (it must fall within a window), CO% too high (max 0.2%) or HC's (max 200ppm) too high?
If its lamda too high check the exhaust sytem thoroughly for leaks/holes. It only needs to be a small hole to send lamda shooting up the scale. It can also be a split in the MOT stations' sample probe (BTDT). I have seen people spend thousands on cats and o2 sensors and ecu's and still fail the mot (on lamda) because of a blowing rear box.
Having said that, as long as its not you who is paying I don't suppose it matters - until they turn round and say "It's your cat mate. Dodgy petrol guv, not covered by warranty"
>> Edited by 911mot on Thursday 29th December 21:22
There are three possibles.
Did it fail on Lamda too high/low (it must fall within a window), CO% too high (max 0.2%) or HC's (max 200ppm) too high?
If its lamda too high check the exhaust sytem thoroughly for leaks/holes. It only needs to be a small hole to send lamda shooting up the scale. It can also be a split in the MOT stations' sample probe (BTDT). I have seen people spend thousands on cats and o2 sensors and ecu's and still fail the mot (on lamda) because of a blowing rear box.
Having said that, as long as its not you who is paying I don't suppose it matters - until they turn round and say "It's your cat mate. Dodgy petrol guv, not covered by warranty"
>> Edited by 911mot on Thursday 29th December 21:22
911mot said:
Can you tell us exactly what reading it failed on.
There are three possibles.
Did it fail on Lamda too high/low (it must fall within a window), CO% too high (max 0.2%) or HC's (max 200ppm) too high?
If its lamda too high check the exhaust sytem thoroughly for leaks/holes. It only needs to be a small hole to send lamda shooting up the scale. It can also be a split in the MOT stations' sample probe (BTDT). I have seen people spend thousands on cats and o2 sensors and ecu's and still fail the mot (on lamda) because of a blowing rear box.
Having said that, as long as its not you who is paying I don't suppose it matters - until they turn round and say "It's your cat mate. Dodgy petrol guv, not covered by warranty"
>> Edited by 911mot on Thursday 29th December 21:22
I shall find out from hatfield in the am, they've got the exact readings etc and I'll post details........The test centre had another box 3.2 facelift fail that day as well.....One thing i know that is also being tried is another test centre, however i know another non porker went in straight after and passed, but lets see.......I'll ask the tech at hatfield for the readings tomorrow..
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