FLCERIK

I went to smog my 993 today and it failed. It failed because the following monitors were not ready:
Catalyst
Oxygen sensor heater
Second air system

I disconnect my battery in the winter since I do not drive the car. The guy at the smog place said "since you disconnect your battery it resets the sensors".

Is this true?
How do I make the sensors read properly so I can pass smog?

g_murray

Dude, do a search, this was and has been a hot topic for a while now. Trust me, there'll be plenty for you to read!

G.

dhicks

You need to drive it for an hour (what a shame) to cycle the sensors.......then you will be good to go.....

FLCERIK

Drive 1 hour without stopping? Is there a sequence while driving for that hour? Or can I just head to the mountains for an hour of fun.

ca993twin

From what I've read here, sometimes they "set" fairly quickly and sometimes they don't. There is a painful driving cycle that will guarantee they will be set. Does Nevada have a smog "referee" system like California? These guys know how difficult it can be to get those codes to set, and will often waive that portion as long as the smog test is good.

Rufus had some reset codes when I went to first smog him. By the time I got to the referee station there were only a couple still unset, and they passed him with flying colors.

dhicks

Hmmmmmm somewhere I have the drive cycle that si required.....I will try and find it and send to you by PM.........

At least this is all I think you have to do......then you can go to somewhere like pepboys and ask them to put it on the OBDII reader and check the registers are all set

FLCERIK

I just got off the phone with Nevada DMV and there are no exceptions. 2 of the 3 sensors must be reset. This happened to me last year and it cost about $500.00 to have the dealer reset all the codes. This is a yearly pain in my @$&..

dhicks

Go to p-car.com and look under technical info....there is a section on readiness codes

dhicks

Its not $500....its just a matter of driving the car....as I said earleir....what a shame......go have some fun for an hours and it should be fine........but first read the p.car site for info

dhicks

For $100 you can get an Actron OBDII reader then you will be able to see that all the codes are set and off you go

ecobb993

Posted numerous times before:

I've used this BMW drive cycle several times with success to take care of the readiness codes:

http://srlx.com/p-car/obdii_readiness.pdf

dhicks

Thanks ecobb...thats the link I was trying to post but could not get to work

Tim993

Can you hook you battery up to a trickle charger durning the winter to avoid the same problem in the future?

Father of 3

JC to the rescue. I was just going to search for your thread on this topic!

D5LV

flcerik,

I have a copy of an article for resetting the drive cycles. I had to use this last year here in Las Vegas. Took me about 45 minutes to do and worked out great. Can send to you if interested. just PM me.