O2 sensor dead. Common problem for Vios.

My friend stalled when traffic jam, luckily replaced under warranty. 2 O2 sensors around RM1,200 if replaced at Toyota.

Keyword here: "Replaced at Toyota"

If you car is out of warranty, you can get it diagnosed at Toyota SC, but replace at outside workshops which should be much cheaper.

Oh also it could be another sensor which is at fault, the MAF sensor, which is also RM600++ at Toyota SC.

That is to say, the only common problem the Vios has are owner problems

No owner = no problem

This post has been edited by dares: Jul 20 2013, 11:21 AM

Vios dugong has drive-by-wire throttlebody. You can't adjust the idling like a cable-driven throttlebody.

At least it is half-decent then

This post has been edited by dares: Jul 20 2013, 01:53 PM

Yes mr. Genius. Do drive your dugong to any outside workshop and ask the mechanic to adjust the idling RPM for you, then come back here and tell us he whack your head with a spanner or a hammer.

Dugong uses drive-by-wire throttle control, the only way you can adjust the idling RPM is to tweak the ECU. The only Vios that can adjust idling RPM old-school style with a screwdriver is the old gen Vios, which uses cable-driven throttle.

lulz

Old and New Vios also use ECU.

Old Vios has cable-driven throttle, therefore you can send to outside workshop to adjust idling RPM.

New Vios (dugong) use drive-by-wire throttle, therefore outside workshop cannot adjust the idling.

Understand the difference?

In the TS's case the problem memang is elsewhere, I suspect the O2 sensors as his case is similiar to my friend's.

For cable throttles, there is a screw on the throttle body that directly adjusts the throttle valve opening when idling.

My guess is O2 sensor faulty will only throw up CEL if it is not responding. If it is feeding bad data to the ECU, the ECU won't know anything is wrong. My friend didn't encounter CEL also until he completely stalled.

the idling screw serves as some sort of easy override on top of the IACV control. This is not limited to just the old Vios, most cable driven TBs have this.





EDIT: my mistake, it doesn't adjust the throttle valve directly, but rather the opening of an alternate air flow route.

This post has been edited by dares: Jul 20 2013, 05:56 PM

Yep, edited my above post to mention that, my mistake