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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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 Posted: Mon Jul 01, 2019 11:30 am Post subject: Oxygen / lambda sensor failure symptoms and lifespan
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My car ('94 C2) has 110K miles on it now and has developed an intermittently hunting idle and slight loss of power.
The Bosch diagnostic tool is reporting that the Oxygen sensor is open circuit so I have a Bosch replacement on order.
I'm curious to know if it is fairly typical for these sensors to fail at this kind of mileage on 993s and whether anyone's had similar symptoms.
Equally, if anyone thinks I'm barking up the wrong tree that'd be good to know too.
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ollster
Montreal
Joined: 10 Jun 2009
Posts: 543
Location: Sheffield
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| Posted: Tue Jul 02, 2019 12:17 pm Post subject:
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mine failed in a similar way (at about 115k) and was much smoohter on part throttle when replaced with a new item
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decgraham
Barcelona
Joined: 17 Sep 2008
Posts: 1363
Location: Spain
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| Posted: Tue Jul 02, 2019 12:58 pm Post subject:
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Hi,
In the Bosch lambda catalogue they say that they are good for 160000 Kms or around 100000 Miles.
If you have poor idle you might want to give the ISV (Idle Stabiliser Valve) a clean, Jackals write up below 
http://www.jackals-forge.com/lotus/993/993_60k_isv.html
ATB 
_________________
1995 993 C2 Cab TipS in Guards Red
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Cameltoe & Heel
Barcelona
Joined: 26 Jan 2009
Posts: 1348
Location: Preston - Lancs
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| Posted: Tue Jul 02, 2019 1:23 pm Post subject:
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These are usually interesting to get off so let us know how you get on.
Trev
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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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| Posted: Tue Jul 02, 2019 4:17 pm Post subject:
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Thanks chaps. The ISV has been cleaned, as has the MAF sensor, so hopefully these are OK.
I'll let you know how I get on with the O2 sensor.
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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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| Posted: Wed Jul 03, 2019 5:33 pm Post subject:
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Well, the old sensor is moving freely on its thread after a light application of Kroil and a little bit of encouragement with a rubber mallet on the end of a 22mm spanner. New unit should arrive tomorrow, so hopefully we will have a result soon.
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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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| Posted: Sun Jul 07, 2019 7:56 pm Post subject:
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The new sensor's fitted and seems to be working perfectly. The idle is stable and performance seems to be restored.
Next job: work out why the allegedly standard new gearbox mount has created a lot of additional noise, vibration and harshness....
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Gwsinc
Newbie
Joined: 04 Sep 2019
Posts: 4
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| Posted: Fri Sep 06, 2019 8:37 am Post subject:
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I replaced my O2 sensor last month at 25 years old and 58000 miles. It had a few bashes in it, I guess from its last engine out job.
Running even better now..
In response to the last comment about your gearbox mount, how are your engine mounts? Your newly firmed up gearbox mounts might be exposing old rubber/loss of fluid in the engine mounts? Just a thought!
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kingroon
Monza
Joined: 15 Oct 2013
Posts: 169
Location: Brighton, UK
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| Posted: Fri Sep 06, 2019 9:11 am Post subject:
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| 9xxnick wrote: | The new sensor's fitted and seems to be working perfectly. The idle is stable and performance seems to be restored.
Next job: work out why the allegedly standard new gearbox mount has created a lot of additional noise, vibration and harshness.... |
Great result..
Could you post a link to the new O2 sensor..? Will be good to keep in my "993" Browser Favourites for future reference..!
_________________
Hasta Luego..
KingRoon
1994 993 Carrera Coupe
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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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kingroon
Monza
Joined: 15 Oct 2013
Posts: 169
Location: Brighton, UK
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| Posted: Fri Sep 06, 2019 9:45 am Post subject:
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Fantastic..! Thanks  Even better with the code WEEKEND17
_________________
Hasta Luego..
KingRoon
1994 993 Carrera Coupe
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cableguy
Watkins Glen
Joined: 10 Sep 2007
Posts: 2046
Location: North Yorkshire
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| Posted: Fri Sep 06, 2019 10:02 am Post subject:
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Currently £79.37 (Bosch) at Eurocarparts with the WEEKEND37 code. 
C.
_________________
Pork!
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9xxnick
Monza
Joined: 29 Jul 2014
Posts: 189
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| Posted: Fri Sep 06, 2019 7:40 pm Post subject:
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Carparts4less and Eurocarparts are the same company. Carparts4less seem to be a little cheaper some of the time but always worth checking both.
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![Porsche 911 [992]](./images/models/Model-992.gif)
![Porsche 911 [991]](./images/models/Model-991.gif)
![Porsche 911 [997]](./images/models/Model-997.gif)
![Porsche 911 [GT]](./images/models/Model-GT.png)
![Porsche 911 [996]](./images/models/Model-996.gif)
![Porsche 911 [993]](./images/models/Model-993.gif)
![Porsche 911 [RS]](./images/models/Model-RS.gif)
![Porsche 911 [964]](./images/models/Model-964.gif)
![Porsche 911 [Early]](./images/models/Model-Early.gif)
