Emissions fail. Require help

Non-Technical Nissan QashQai chat. Mk2, Mk3
Post Reply
MrUrban83
Posts: 3
Joined: Tue Jun 08, 2021 11:39 am
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by MrUrban83 »

Hi guys, im new to the forum, and in dire need of some advice.
The mother in laws 2014 1.2 Quashqui failed its MOT 10 days ago on emissions.
The nissan garage she brought it from 8 months ago are struggling to sort it after 2 more failed MOT's, again on the emissions.
So at the moment we are stuck. Does anyone have any ideas on how to sort this problem?.
They say they have plugged into the ecu and its running at its right settings etc, spark plugs have been replaced. All i can think of is that there is still too much fuel being put into the cylinder and is burning to rich.

Any help and advice is very welcome.

Cheers

lewisbryant
Posts: 336
Joined: Sat Feb 23, 2019 7:27 am
Qashqai Model: Mk.3 Qashqai - J12 (2021+) New Model

Post by lewisbryant »

Does it run rough at idle? If so I would suggest cleaning the intake valves as these can get coked up therefore lack of air.

Make sure there isn't a p0011 fault code in the ecm, if it is then it will require a intake valve timing solenoid

Check engine timing

Could possibly be injectors
Also could be an software issue as some of the 1.6 nissan engines were failing mot and a software update sorted it
User avatar
calnorth
Posts: 2719
Joined: Mon Feb 11, 2019 2:01 pm
Qashqai Model: Mk.2 Qashqai Facelift - J11b (2017–2021)

Post by calnorth »

A Nissan garage can't fix it? Complain to UK Nissan and go elsewhere.

I assume its petrol? But emissions is an easy one and either over fuelling (metering) as you say or an O2 sensor problem...the latter causing over fuelling?

Diesel is largely DPF and related issues.
Mk2 Qashqai Facelift - J11b (2017–and onward)
1.6 Dig-T N-Connecta
MrUrban83
Posts: 3
Joined: Tue Jun 08, 2021 11:39 am
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by MrUrban83 »

It runs nice at idle. Never noticed anyproblem.
I did some research yesterday and it failed last year on the same thing, then passed, so there is a curable problem.
The garage have just got back to her and say they have changed the CAT, is the O2 sensor on the CAT?
User avatar
calnorth
Posts: 2719
Joined: Mon Feb 11, 2019 2:01 pm
Qashqai Model: Mk.2 Qashqai Facelift - J11b (2017–2021)

Post by calnorth »

MrUrban83 wrote: Tue Jun 08, 2021 12:22 pm It runs nice at idle. Never noticed anyproblem.
I did some research yesterday and it failed last year on the same thing, then passed, so there is a curable problem.
The garage have just got back to her and say they have changed the CAT, is the O2 sensor on the CAT?
Not far from it in the exhaust system
Mk2 Qashqai Facelift - J11b (2017–and onward)
1.6 Dig-T N-Connecta
david sunderland
Posts: 381
Joined: Fri Mar 17, 2017 12:47 pm

Post by david sunderland »

Found in the past if petrol or diesel have been used around local then a good blast down a motorway can clean things out does not have to be fast just stay in 4 th and keep revs above 3000 for a 30 min run then turn back pm
Qashqai tekna 1.2 petrol dig 6. 3. 17. gunmetal grey. glass roof m\ t...............now RENAULT KADJAR GT 160 BHP same as the QQ same car
MrUrban83
Posts: 3
Joined: Tue Jun 08, 2021 11:39 am
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by MrUrban83 »

Thats for your suggestions, turns out it was the catalytic converter. If it has done any lasting damage we shall see, but hopefully not.
User avatar
calnorth
Posts: 2719
Joined: Mon Feb 11, 2019 2:01 pm
Qashqai Model: Mk.2 Qashqai Facelift - J11b (2017–2021)

Post by calnorth »

MrUrban83 wrote: Thu Jun 10, 2021 12:13 pm Thats for your suggestions, turns out it was the catalytic converter. If it has done any lasting damage we shall see, but hopefully not.
Interesting...how much did they charge for the Cat itself. Usually very expensive things.

Detail on Cats and their function/problems here:

https://www.rac.co.uk/drive/advice/car- ... onverters/
Mk2 Qashqai Facelift - J11b (2017–and onward)
1.6 Dig-T N-Connecta
Post Reply