Rick3452

What is the "faint" clicking sound that comes from my fuse/relay box. it seems to change as my speed changes. I only here it at fairly slow speeds and as I increase speed the clicking does as well?
Thanks for any ideas!
Rick 82 5 speed

SteveG

I believe this the counter that is activated at 60K or multiples related to the 02 sensor. There is a way to reset it. Search under oxygen sensor or 02.

Garth S

Also agree that the O2 sensor counter is possible - remove the two large headed 'thumb' bolts securing the ~14" long cover to the passenger side doorsill; The 'Rube goldberg' contraption under there is an electro-mechanical' counter from another era. Push in the white reset button - or disconnect .... and listen ...

Rick3452

Thanks guys, will try..
Rick

epbrown01

Does this apply to the '83 as well - I've got some clicking going on in my passenger footwell too.

Emanuel

Marc Schwager

Disconnected mine a few months back, AFTER repacking the front passanger wheel bearing. I knew that clicking was coming from the front end somewhere :-)

Nicole

Are you guys shure it's not one of the vacuum operated flaps? If it's speed related, the pressure might change with engine speed, and a small leak might make the flap flip flop whenever the pressure falls under a certain amount.

sharkmeister85

What is the purpose of this O2 counter and is it on all model years?
Glenn

SteveG

Re purpose of the counter. I believe was Porsche's overengineering dept, giving us an audio reminder. Extending that logic, I guess they think you should replace the sensor every 60K.

sharkmeister85

Thanks, SteveG. I recently replaced my O2 sensor. Must have run the original for 120k and never heard any clicking. Should I reset or disconnect it, or just leave well enough alone (my first choice)?
Glenn

SteveG

I would leave the counter alone unless you want the 60K reminder anyway. O2 sensors have a long life, IF it's been a clean life, by that I mean the system has functioned properly, no excessive rich running, etc. I have a Honda, very similar to Bosch system, in fact it is discussed in the Bosch manual, car and O2 sensor with 218K. Recently checked mileage = 36 highway. YMMV, but I haven't seen any discussion on our 928 sensors going bad w/o some other contributing factor.

epbrown01

I'm pretty certain. I've got the flap symptom as well, but I only get it when I've got the heat on (I rarely used the AC). With cold nights hitting, I just started noticing it. But the clicking and the occasional warning light with no message makes me pretty sure it's the O2 sensor. I'm due for a new one on the 911 as well.

Emanuel

damonoresky

Reviving an old thread.

I am hearing a clicking from the dash area on the passenger side sometimes. Seems to increase with the speed of the engine. My car has only 45k on it but this thread seems to indicate 60k for the O2 sensor. Unless it's different for 1991 like mine? Doesn't happen all the time but when it does you can hear it pretty easily.

Any other ideas?

WallyP

The counter is only on the early cars with an oxygen sensor. At that time, no one actually knew the real-world life expectancy of an oxygen sensor. Most manufacturers just gave a mileage for replacement, but Porsche decided to give an indicator light at 60,000 miles. The sensor replacement light has NOTHING to do with the actual performance or need for replacement of the sensor - it just tells you that the car has been driven 60,000 miles since the counter was reset. There is no problem with just disconnecting the counter under the door sill cover.

No late-model 928 has the counter.

damonoresky, I would suggest that you open the Central Electric Panel, and determine if one of the relays in the panel is clicking. If so, let us know which one...

longleader

You guy rock, I replaced the wheel bareings, rotors and pads and I still had a clicking noise it ended up being the o2 counter.it was driving me mad