MOT and the EML?
Discussion
Hi guys
My mother in law has an old Almera that's had the engine management light on for some time. Fault codes show up as O2 sensor fault. At the last mot her friendly old mechanic changed all the sensors, which didn't solve the problem so he diagnosed it as being somewhere in the wiring. He advised she not spend the money on tracing the fault as the car is not worth it. He also suggested that the light went out when he actually started the car, so he could pass it this year (
) but she was not to return next year for the mot!
As it happens the car runs perfectly sweet but it's now due it's mot again and no friendly mot guy anymore. I'm going to run it through for her to see if there are any other failure points and then decide what to do thereafter.
Anyway, given she has run around with the light on for a year, it's a pretty much useless light now as it won't tell her if any other issues as its permanently illuminated by this seemingly unfixable wiring fault.
Does she have any options here? Would it be difficult to wire it to another light in the cluster than behaves the same in the start up procedure?
Or could the offending sensor wiring be butchered to send back and 'all clear' signal to the ecu? Therefore losing only the reading from that sensor.
Seems a shame to move on a solid car for such a small issue.
Another question. When I clear the code with my Bluetooth reader/ android tablet, it stays off for a good few minutes. At what point would the tester normally check the lights?
Could I clear it before handing the keys over and sit in the viewing bay and keep trying to clear the code and maybe get away with it I wonder?!
My mother in law has an old Almera that's had the engine management light on for some time. Fault codes show up as O2 sensor fault. At the last mot her friendly old mechanic changed all the sensors, which didn't solve the problem so he diagnosed it as being somewhere in the wiring. He advised she not spend the money on tracing the fault as the car is not worth it. He also suggested that the light went out when he actually started the car, so he could pass it this year (
) but she was not to return next year for the mot!As it happens the car runs perfectly sweet but it's now due it's mot again and no friendly mot guy anymore. I'm going to run it through for her to see if there are any other failure points and then decide what to do thereafter.
Anyway, given she has run around with the light on for a year, it's a pretty much useless light now as it won't tell her if any other issues as its permanently illuminated by this seemingly unfixable wiring fault.
Does she have any options here? Would it be difficult to wire it to another light in the cluster than behaves the same in the start up procedure?
Or could the offending sensor wiring be butchered to send back and 'all clear' signal to the ecu? Therefore losing only the reading from that sensor.
Seems a shame to move on a solid car for such a small issue.
Another question. When I clear the code with my Bluetooth reader/ android tablet, it stays off for a good few minutes. At what point would the tester normally check the lights?
Could I clear it before handing the keys over and sit in the viewing bay and keep trying to clear the code and maybe get away with it I wonder?!
aw51 121565 said:
Put it in for the MoT and see what happens. It won't be a wiring fault , I suggest a Nissan specialist - or a Nissan forum - will be able to explain the issue and offer solutions (if the last MoT tester was suggesting a wiring fault after "changing all the sensors" then I'd suggest he/she isn't worth their salt).
As a starter for ten, modern/recent vehicles have TWO O2 sensors - one upstream of the catalytic converter and the other downstream. A mismatch between expected values from the two sensors (such as a cat failure) will flag a fault and light up the light - but my spidey sense suggests the downstream O2 sensor has gone
as the Almera passed the emissions test last MoT.
Full diagnostics will point to the fault
; trying a new MoT tester sounds like a plan 
!!
Thanks for the reply. This new fault developed after a long and expensive offering fault that also trough the eml. Turns out the only Renault part on the car (timing chain) had stretched! , I suggest a Nissan specialist - or a Nissan forum - will be able to explain the issue and offer solutions (if the last MoT tester was suggesting a wiring fault after "changing all the sensors" then I'd suggest he/she isn't worth their salt).As a starter for ten, modern/recent vehicles have TWO O2 sensors - one upstream of the catalytic converter and the other downstream. A mismatch between expected values from the two sensors (such as a cat failure) will flag a fault and light up the light - but my spidey sense suggests the downstream O2 sensor has gone
as the Almera passed the emissions test last MoT.Full diagnostics will point to the fault
; trying a new MoT tester sounds like a plan !!A different garage had only months before changed the timing chain and crank/ cam sensors.
The new mot man was clearly pulling porkies about the warning light, making out he had done her a favour. But She does have an invoice for two O2 sensors. Whether they were changed or not is another matter.
Claudia Skies said:
Why not talk to the Nissan dealer? You're far more likely to get help than under the railway arches or from the council. As someone else has said; step 1 is proper diagnosis.
It's an 11 year old worthless nissan. Step one is to see if it passes. If it does, there is no step 2, other than drive it! imagineifyeswill said:
EML light isnt an MOT fail, the light on quite possibly is a wiring fault there is a well known fault with the wiring loom round the steering column on Almera,s requires a part loom replacement by Nissan, expensive I would just ignore it.
Interesting. Any more info on the fault please?Toaster Pilot said:
Unfortunately it's not just an EML on for no reason - it failed quite badly on emissions and smells rich when running like the cat isn't even fitted.
I've only just bought it and driven it nearly 100 miles to my workshop (drove like there's nothing wrong) - will report my findings when I actually start diagnosis
Glad it got you home. I never doubted it. I've only just bought it and driven it nearly 100 miles to my workshop (drove like there's nothing wrong) - will report my findings when I actually start diagnosis
Good luck with it, pleasure to meet you.
Toaster Pilot said:
Looks like you're well rid of it - f
king clutch started slipping like a bd today, had to wait till after I'd taxed it too! 
Oh no! That's bad timing, karma for the easy MOT pass? I've never changed a clutch in my life, but can't be a massively ruinously expensive job can it??king clutch started slipping like a bd today, had to wait till after I'd taxed it too! ETA: http://www.ebay.co.uk/itm/NISSAN-ALMERA-1-5-PRIMER...
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