Date:         Fri, 25 Jul 2014 17:00:02 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: O2 sensors brand quality difference?
Comments: To: Neil N <musomuso@GMAIL.COM>
In-Reply-To:  <CAB2Rwfgmdj-4L_OHPVq_UpdFGnqwNQjWPuQPXi7o6HS+8hKXJA@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

The Vanagon operates the O2 sensor heater continuously. Since it is so far away from the engine it is needed especially for idle and low speed operation. It is used on many vehicles to get them into closed loop operation as soon as possible. Many vehicles even have heated catalytic converters and sometimes other tricks are used to get the cats "lighted". On my 1992 600 SEL the transmission upshifts are delayed when cold to get the revs up to help get the cats lighted.  

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Neil N
Sent: Friday, July 25, 2014 4:02 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: O2 sensors brand quality difference?

Don: my Digifant Haynes is buried in a box, somewhere.   ;)
Does your version of Digifant use a Heated O2 Sensor (HO2S) relay or "module" ?

Looking online it seems it doesn't but if it does....

I wonder if this module controls the heater circuit under certain conditions.
i.e. extended periods of idle on a cold day?

Neil.

On Fri, Jul 25, 2014 at 12:19 PM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:

Heating is purely an emissions enhancement for cold running.  Sensor is
> useless until it heats up, which doesn’t take long in our short exhausts.



--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej