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P01903 (?) exhaust gas temperature sensor rear

7K views 10 replies 3 participants last post by  confuseddotcon 
#1 ·
Hello,my '09 95 1.9 TiD Estate recently went into limp-home mode.

Cutting a long story short a "main dealer" (really a Vauxhall shop with a Saab sideline)

- did a manual regeneration, which apparently cleared limp-home mode
- and (when the CEL didn't go out after above)
- diagnose "P01903exhaust gas temperature sensor rear"
- to add to the above they also noted "Threads on sensor may be broken in which case a new DPF will be required"

Next day after this, on a (summer holiday) from Ireland to UK, limp-home made a reappearance and has not gone away, despite several attempts at dropping gear and increasing revs on dual-carriageway.

I have read of other cases of 'DPF hell' with Saab 1.9 and other diesels.

A) How likely is it that replacing above sensor will fix the fault once for all
B) Should I be alarmed about the 'threads may be broken' and how do threads get to be broken when the only people to have touched this part is tech at said "main dealer". Is there a workaround other than replacing (or removing which also seems popular) DPF.
C) Is there a Vauxhall equivalent p/no for the rear exhaust sensor ?
D) Could the sensor replacement (including any possible workaround for broken threads) be left to my local independent garage who I regard as much more reliable than above "main dealer", or it is a 'special Saab job' ?My Haynes Manual makes it look straightforward to access and remove, but doesn't give more than a single b/w photo.

Any help appreciated, both on temp quick fix (for a very long story my ever-suffering wife now has the car in Ireland and hopes to be able to drive home...) and a more 'final solution'
-
 
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#2 ·
Hello I suppose what they were saying about broken threads on the. Sensor is that when they try to remove it , it may snap off . They were just covering there back , with that comment .
You could always try some plus gas a few days before hand to free it up .
Most garages Thease days shoukd be able to tackle a job like that .
Get a second opinion first from your trusted garage then take it from there .
 
#3 · (Edited)
There is a procedure in the Saab WIS for troubleshooting the sensor....couple of pages below.
You can easily check the voltages and then decide to change.
Whats the mileage on the car ..if its above 100K then its due for a DPF i'm afraid.

I would think the sensors are common between the 9-3 Z19DTH and the 9-5 even though the part nos are different on the EPC.
(probably sensors for other Z19DTH variants too but connectors may be different=as they use the same DPF hardware)
eg

Although spotted this too..
http://www.ebay.co.uk/itm/SAAB-9-3-...993260?hash=item36051c952c:g:sdQAAOSwyQtVp9fx
http://www.ebay.co.uk/itm/SAAB-9-3-93-Exhaust-Temperature-Sensor-2005-2010-55557052-Z19DT-Z19DTH-Z19DTR-/182208531492?hash=item2a6c798c24:g:XFkAAOSwtnpXi1NN




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#5 ·
Hi @Lizzard-t and @cjapeterborough,

thanks for those replies. cja - that WIS extract is very helpful - much clearer than Haynes. It does look like a very straightforward job, makes me wonder why the 'main dealer' I mention above is quoting ~£240. I am nervous that they broke the sensor, and don't wish to admit it and hope I will go away (hence high price).

Mileage on the 95 is low '90s. I had not appreciate the DPF only lasting into 100K. There seem to be places that will remove the DPF (while still keeping car within permitted emissions ?) Is that a viable long-term solution or a pathway to more problems ?

Are there any 'quick fix' that might get out of limp-home mode / are there any dangers to the engine in driving while in said mode. car is currently in extreme NW of Ireland, a long way from any Saab specialists, but probably some handy mechanics and reasonably well equipped Vauxhall workshops
 
#6 ·
Could always try disconnecting the battery for , half an hour ( make sure the ignition key is not in the ignition . Re attach battery , then start and leave to idle for 10 mins then drive it . But if there is a fault there then it will rear its ugly head again .
The reason why limp home mode exists is just that m so you can get it home but under reduced power , to guard against possible further damage to components .
 
#7 ·
Well I guess some garages want to make more money than others....labour about 1hr I should think max...independant labour rates should be about 50eur/hr.
DIY with a multimeter and a couple of axle stands would be my way ...at least you can easily check if the sensor has been knackered.

If you are UK based then going the DPF removal route is becoming much harder due to changes in legislation and tightening up MOT procedures.
Basically its too risky now in the UK now imho.If caught the costs of putting it back together again could scrap the car.

As for Eire well you would probably get away with it although the cost of doing it will about the same as replacing the DPF and good for another 100K?
Apart from ripping the guts out of the DPF or putting in a space pipe then the car will require remapping to remove the regen routines and ignore the EGR.
 
#8 ·
Hi,

thanks again cja for the input. Sorry for the lack of reply - I've been 'off the road' for a while. Cutting the aforementioned long story short, my wife ended up driving the car to/from Ireland with kids and holiday luggage as I had to return separately to have a surgical procedure on my hand -- that stopped me from driving for a bit and then I was away travelling.

I'm now back in action and the 9-5 is actually driving really nicely apart from not 'pulling' about ~~45 mph/3000 revs.

Am minded to ask convenient independent garage about replacing just the sensor to see if that helps.

Need to think about the full DPF replacement, I don't mind the expense so much as I'd really like to avoid going back to main dealer and not sure the independent will be able to do it (since there seems to be some re-calibration of the ECU required at the end. )

Will post again, hopefully with car returned to 'CEL-free' state !
 
#9 ·
Hi,

spoke with my local independent garage today; he seems quite comfortable and to appreciate what needs doing, as already noted he did advise of the risk of the sensor stripping threads on removal. cjapeterborough - I think he appreciated that extract from the WIS.

Only issue is to confirm the correct replacement part.

I found this on the internet :


Temp Sensor

Looks like the part number is 55557662. Grateful if anyone can confirm this is correct part.. Just a thought, there are 2 temp sensors, front and rear - is it same sensor in each ? Presumably rear is nearest that same part of the car ?

Also any further tips or experience on completing this satisfactorily that I can pass onto the garagiste.

KRs
 
#10 ·
Yes there are two and they are both different.

The sensors are different ...I'm not 100% sure but think 55557662 is the rear sensor and 55556983 is the front.
I would try and verify that the sensor is indeed faulty first before replacing anything.
There are simple tests you can do with a multi meter measuring the voltage output from the sensor and if there is a good ground.
The fault could be with either the sensor itself or a crimp in the wiring somewhere for example.
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#11 ·
Hi,

my local independent garage has tried and failed completely to remove the old sensor.

They are suggesting to move to complete DPF sensor replacement - based on the comments earlier in the thread from @cjapeterborough that doesn't sound unreasonable (just painful in £)

While the DPF procedure is described pretty well in the Haynes manual, I wonder if anyone has access to the Workshop Info System which provided those nice pix of the sensor replacement, to provide same for the DPF.

And any more detailed information on how to do the re-calibration with the ECO post-op ?

KRs !
 
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