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Topic: H02 sensor ? (Read 1059 times) |
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reedyone
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H02 sensor ?
« on: Jan 29th, 2017, 12:16pm » |
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95 cosworth 2.9 , using a hand held OBD reader I'm getting a fault reading of HO2 bank 2 sensor 2 high voltage , ive changed the sensor after the cat on the N/side exhaust and cleared the fault code but it comes back on . the wires at the plug all seem ok , I'm I missing the obvious here ? help.....
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: H02 sensor ?
« Reply #1 on: Jan 29th, 2017, 12:37pm » |
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Could be a short in the wiring loom - the insulation breaks down and crumbles 
Wiring around the engine area seems to suffer most.
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Sierra XR4i's are great...especially when fitted with 4WD 
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reedyone
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Re: H02 sensor ?
« Reply #2 on: Jan 29th, 2017, 5:49pm » |
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when the sensor plugs in under the car is there another connection in the engine bay as it seems to disappear into the harness ,where do I disconnect at the opposite end to test the wires ?
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Simmo
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Re: H02 sensor ?
« Reply #3 on: Jan 29th, 2017, 6:24pm » |
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This page gives detail of the connections with wiring colours and may help you trace the wires. 
This wiring diagram from Snoopy may also help.
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reedyone
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Re: H02 sensor ?
« Reply #4 on: Jan 29th, 2017, 10:06pm » |
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cheers , looks like fun !!  it least its still running good just mpg is a bit poor 18.5 round town
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Scorpio_Mike
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Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: H02 sensor ?
« Reply #5 on: Jan 29th, 2017, 10:25pm » |
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on Jan 29th, 2017, 10:06pm, reedyone wrote:| cheers , looks like fun !! it least its still running good just mpg is a bit poor 18.5 round town |
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Try running a 4 litre Jeep and then you'll have something to complain about 
I'd be very happy to get 18.5 round town 
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Star sign is Scorpio !
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amigafan2003
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Re: H02 sensor ?
« Reply #6 on: Jan 29th, 2017, 11:29pm » |
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"Sensor 2"'s are post cat sensors - they don't affect the running of the car at all, they are just there to monitor the condition of the cat.
You can ignore it (or even remove both post cat sensors - the car wont care).
The pre cat sensors are the ones that affect the fuelling.
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a900one
Full Member
A scorpio is for life not just for christmas
Posts: 980
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Re: H02 sensor ?
« Reply #7 on: Jan 30th, 2017, 11:53am » |
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18.5 seems ok to me, I get about the same, and 24-25ish on a run, depending on size of shoe  .
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reedyone
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Re: H02 sensor ?
« Reply #8 on: Jan 30th, 2017, 7:44pm » |
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I didn't realize the post cat sensors didn't effect the running ! something else ive learned ,cheers , the emissions were a bit high at MOT time and when I got the fault code up I just thought it was that . Scorpio mike ive a 1959 newyorker as well 6.8L does 10 mpg on a run I don't dare think what it is around town never thought my discovery 1 would be my economy car !!! thanks everyone
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