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        General >> Give/Need advice to/from others >> DTC P0158
        
(Message started by: Tenfut on Mar 9^th, 2013, 5:43pm)

Title: DTC P0158
Post by Tenfut on Mar 9^th, 2013, 5:43pm

Anyone know if this code influences emissions, MOT due in 10 days

TIA

Tony

Title: Re: DTC P0158
Post by Tompion on Mar 9^th, 2013, 6:27pm

P0158 Downstream Heated Oxygen Sensor circuit Voltage High - Bank No. 2.

Downstream sensors are said not to influence emissions.

Title: Re: DTC P0158
Post by Tenfut on Mar 11^th, 2013, 7:57pm

Thanks Tompion for your input

That is the only code coming up so I suppose its a case of leave well alone and wait and see.

Fingers crossed

Tony

Title: Re: DTC P0158
Post by amigafan2003 on Mar 11^th, 2013, 8:16pm

Downstream sensors are there to monitor the condition of the cats, so in theory you could have a broken cat and not know about it.

broken cats can affect emissions.

Title: Re: DTC P0158
Post by Tenfut on Mar 11^th, 2013, 10:20pm

I had a feeling that might be the case.

My scanner is a U380 not sure of the brand and that was the only code that showed. I cleared if then went for a 20 mile blast down the motorway and the code didn't come back. Does that tell me anything?

How would I know which (if either) cat is not working.

I will have to chance the MOT now as I wont have time to change a cat.

Tony

Title: Re: DTC P0158
Post by Tompion on Mar 12^th, 2013, 12:25am

It's bank 2, have a look here to see which side that is:
http://www.fordscorpio.co.uk/ho2smonitor.htm

Title: Re: DTC P0158
Post by Tenfut on Mar 12^th, 2013, 9:40am

So passenger side then

Title: Re: DTC P0158
Post by Glyn on Mar 17^th, 2013, 10:15pm

Tony
Does your U380 read ABS as well?
Glyn

Title: Re: DTC P0158
Post by lesterlad aka Rodders on Mar 17^th, 2013, 11:56pm

I have a U380 and unfortunately it doesn't read ABS

Title: Re: DTC P0158
Post by Glyn on Mar 21^st, 2013, 1:54am

Thanks for that. Do any of these scanners in the lower price range read ABS ? Anyone know ?

Title: Re: DTC P0158
Post by Simmo on Mar 21^st, 2013, 7:11am

on 03/21/13 at 01:54:09, Glyn wrote:

Thanks for that. Do any of these scanners in the lower price range read ABS ? Anyone know ?

Glyn as far as I know they do not. :(

Title: Re: DTC P0158
Post by ADroste on Mar 21^st, 2013, 6:40pm

on 03/11/13 at 22:20:31, Tenfut wrote:

... I cleared if then went for a 20 mile blast down the motorway and the code didn't come back. Does that tell me anything?...

I don't think so. If I remember well, after clearing such an emssion related code, which in newer cars should trigger the motor control indicator, you need to complete ten full OBD cycles, before it reoccures. One OBD-cycle starts with cold engine and ends with a warm engine after exceeding a certain speed value and control unit has reached closed loop condition.

I played that game recently with a KA of 2004. Motor control indicator showed up and MOT failed although emission were below limits. After two weeks and having cleared the code directly before I drove to MOT station KA passed MOT without problems. Emissions again were well below limits. After nine times travel to work, indicator came up again.

This shows me that there is a mismatch in the specification of (downstream) Lambda probes and the efficiency of catalytic converters. In my case the probe warns too early. I think such tolerance problems are well known to every engineer. I assume to prevent expensive legal quarrels in US and high pollution penalties, car manufactures choose the safe side.

Regards
Armin

Title: Re: DTC P0158
Post by Glyn on Mar 22^nd, 2013, 1:18am

Thanks Simmo. Shame.