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Old 07-09-2010, 04:13 AM   #1
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Join Date: Jul 2010
Location: Cambridge, UK
Posts: 1
UK P1115 Code and Pre-Cat O2 Sensor Help


I have a UK Boxster S 986 2001. I have the CEL light on and the diagnostics say its code P1115, pre cat O2 sensor.

I have a couple of questions-

How easy is this to change, Im not to cleaver with a spanner?
Is there a guide on-line that I can follow?
Are the pre and post cat sensors the same?
Of the two sensors on this page what one do I need-http://www.eurocarparts.com/ecp/k/o2/p/Car-Parts

Thanks guys!
Spamalot is offline   Reply With Quote
Old 07-09-2010, 11:37 PM   #2
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Join Date: Apr 2006
Location: nj
Posts: 389
O2 sensors are very easy to change with the right tools. You can use a closed end wrench (spanner), but the job will be easier with a specialized oxygen sensor tool (see photo attachment below) and they're cheap, around $10 here. Use a long ratchet with this because you'll need some leverage to loosen the sensor. Spraying the sensor with WD40 or something similar on the threads first is helpful.

It's generally recommended that all 4 sensors be replaced at once. Your car will run significantly better. You may be able to get by doing one, but you're postponing the inevitable. You'll save time and money by doing all 4 at once.

There are many cheap "universal" O2 sensors that can be made to work, but IMO it's not worth the trouble or taking the chance. Spend a little more and get the ones with the OEM type connectors, then you'll have no worries. This Porsche specialist had the best prices for the OEM type when I bought 6 months ago. They may be cheap enough to justify posting them to the UK.


Search the site for MANY threads about O2 sensors and related CEL (check engine light) codes.

Also, invest in a Bentley shop manual. You'll get a lot of use out of it.


Let us know how you make out.
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