O2 sensor

Ask for and share advice on using the PicoScope kit to fix vehicles here.

O2 sensor

Postby PeterM » Sun Apr 18, 2010 12:13 pm


Appreciate if you could tell me exactly how you would check the response time for a zirconia O2 sensor.

Thanks Peter
Posts: 9
Joined: Fri Jun 26, 2009 2:51 pm
Location: Saddleworth

Re: O2 sensor

Postby Autonerdz » Sun Apr 18, 2010 2:19 pm


You would first make sure the sensor is fully warmed up. Then let the engine idle until O2 is cycling. Then perform a WOT snap throttle. The initial gulp of air will drive the O2 max lean and then the accel fuel dump will drive it max rich. The lean level should be <100mv and the max level >800mv. 80% or so of the lean to rich switch here should occur in <100ms.

This only means that the O2 is OK at the time of testing. Intermittent issues are common.

Tom Roberts
(The Picotologist)
skype: autonerdz
THE PicoScope Automotive Authority
In North America
User avatar
Zen Master
Zen Master
Posts: 279
Joined: Wed Nov 20, 2002 4:19 pm
Location: Washington State USA

Re: O2 sensor

Postby shay » Thu Aug 19, 2010 3:35 pm


Posts: 2
Joined: Wed Mar 10, 2010 6:27 pm

Return to Diagnostic discussion

Who is online

Users browsing this forum: No registered users and 0 guests