Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Porsche 911
992 : 2019- 0
991 : 2011- 21
997 : 2004- 63
996 : 1997-2005 32
993 : 1993-1998 4
964 : 1989-1993 0
Carrera 3.2 : 1983-1989 2
Carrera SC : 1977-1983 1
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 26
Cayman : 2005- 20
Cayenne : 2003- 5
Macan : 2014- 3
Panamera : 2009- 0
912-914-924-928-944-968 0
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [992] 2018-Current
Porsche 911 [992]
911 [991] 2011-2019
Porsche 911 [991]
911 [997] 2004-2012
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
Rob Grove

Joined: 23 Nov 2019
Posts: 2

PostPosted: Sat Nov 23, 2019 4:38 pm    Post subject: Porsche 997.1 TPC Lights Reply with quote

Hi there, I’m relatively new to the 997 game and I have a question that I think only a thread can answer. I’ve recently bought into a 2007 gen 1 Targa. When I bought the car I was aware that it kept showing “TPC INACTIVE” and throwing an exclamation mark on the instrument dials. The wheels had curbing damage so I’ve had them refurbished and new valve sensors put in for the TPC issue. After I got the car back I performed a reset on the TPC system in the on board computer and expected it to fix it. However, the car still gives me the exclamation mark and TPC INACTIVE message but seems to be giving me the tyre pressures for the right hand side? These sensors only cost me £20 so I’m very sure they’re not OEM parts but seem to work on the right but not the left. On the left hand side of the car I do actually have an odd tyre that isn’t the same as the other three and I believe this may be the cause of the issue by confusing the TPC system, but before I spend the £240 I was quoted for a matching tyre I’d like to get an expert opinion.

Thanks, Rob
View user's profile Send private message

Joined: 22 Jul 2013
Posts: 263
Location: Shropshire

PostPosted: Sat Nov 23, 2019 5:41 pm    Post subject: Reply with quote

£20 sensors and an odd tyre? I rather feel you already know the answer!
Sort your tyres and buy some decent sensors, they don't have to be OEM just a reasonable make and obviously the correct frequency. Search TPMS Porsche in Ebay.
Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.

We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
View user's profile Send private message

Joined: 21 Mar 2015
Posts: 7701
Location: Brighton

PostPosted: Sat Nov 23, 2019 7:13 pm    Post subject: Reply with quote

Tyre pressure sensors work on pressure .. a diaphragm in the unit will be compressed under pressure and give a reading ( voltage ) .. not exactly the case but it gives you an idea ..

The type of tyre will have no effect on the pressure that's inside the tyre .

The sensors at that price are not OEM.

Even OEM ones can be a pain to get working .. 20 miles road test on a gen 1 at least in learning mode to get a reading .

Sometimes they even need to be coded on .

Do not get Gen 2 sensors by mistake .. always get the ones for your car which will be gen 1 sensors .. this isn't gen 1 997 .. this is the generation of the sensors .

You don't have to fit new sensors if you don't want to .. they can be coded off to remove the warning message .
My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .


7pm - 9pm

Indy Mechanic .
View user's profile Send private message
Rob Grove

Joined: 23 Nov 2019
Posts: 2

PostPosted: Sat Nov 23, 2019 8:30 pm    Post subject: Reply with quote

Thank you both, I have seen the message pop up that the car is learning, but I immediately dismissed it. Tomorrow I shall take the car out for a 20 mile ish journey and see if that makes a difference. I’m guessing once it has learnt it will say so or start displaying the pressures? I’ll let you know how it goes.
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Page 1 of 1

Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum