02 sensor help needed - Engine Troubleshooting


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02 sensor help needed

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

Johndaily693
Novice

Jun 14, 2014, 4:33 AM

Post #1 of 3 (1573 views)

02 sensor help needed	Sign In

My post cat 02 sensor reading from the obd stays constant at 0.85v with small movements only is this normal? Is the figure of 0.85v normal or too high? What is the normal range?

Also the feul trim shrtft12 for this sensor is 99.2% , is this figure normal or too high also this figure does not chnage much either ?
What does the high voltage and high shrtft12 mean exactly and is there is a problem?

My vehicle is. Lpg vehicle , rover 25 , 1.6 engine , 2003 , 52000 miles on clock.

Even if you do not know much about the model or car , do the figures above look right for any vehicle?

(This post was edited by Johndaily693 on Jun 14, 2014, 6:17 AM)

GC
User
GC profile image

Jun 14, 2014, 7:17 AM

Post #2 of 3 (1556 views)

Re: 02 sensor help needed	Sign In

Often generic code readers substitute values for fuel trims. If the trim is excessive, it will set a rich or lean code. If the 02s is acting up, it will usually set a code as well. Dont have this vehicle here in US. Are there trouble codes stored, or are you just playing around with a code reader?

____________________________________________________
Willing to help, willing to learn... Rob

nickwarner
Veteran / Moderator
nickwarner profile image

Jun 14, 2014, 9:42 AM

Post #3 of 3 (1543 views)

Re: 02 sensor help needed	Sign In

Also your post cat 02 doesn't affect fuel trims. It is merely a catalyst monitor. If the cat is working right, it should read richer than the pre-cat as the catalyst is using up oxygen during its chemical reaction.

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