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Discussion Starter · #1 ·
Hi everyone.

Last June I bought a 2015 c4 cactus 1.6 Blue HDI. It now has around 80k miles on the clock.

A couple of days ago the amber engine warning light went off. I have a Zus system on my car and the error code was P2207 NOx Sensor Heater Control Circuit High Bank 1. I took it to an independent garage who confirmed this was the same error code they were getting. They reset the warning light and it went off. Drove around for a couple more days and it has turned on again. The Zus system is giving the same error code.

I understand a NOx sensor replacement can be quite expensive so I have a few questions:

1. Does the sensor necessarily need replacing?
2. How much might I be looking at paying for parts/ labour?
3. Is there any relevant recall, emissions issue or extended warranty that could help to pay for this?
 

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WelshCacti03 said:
Hi everyone.

Last June I bought a 2015 c4 cactus 1.6 Blue HDI. It now has around 80k miles on the clock.

A couple of days ago the amber engine warning light went off. I have a Zus system on my car and the error code was P2207 NOx Sensor Heater Control Circuit High Bank 1. I took it to an independent garage who confirmed this was the same error code they were getting. They reset the warning light and it went off. Drove around for a couple more days and it has turned on again. The Zus system is giving the same error code.

I understand a NOx sensor replacement can be quite expensive so I have a few questions:

1. Does the sensor necessarily need replacing?
2. How much might I be looking at paying for parts/ labour?
3. Is there any relevant recall, emissions issue or extended warranty that could help to pay for this?
1. It may need replacing but it could be a wiring loom issue.
2. If Citroen replace it, it could be ~£400
3. There may be a wiring loom recall, IIRC there was a recall issue on C4 Picassos. Warranty will only pay if you actually have one. I would always recommend the Citroen extended warranty, which you can only get after 3 years if the car has a proper service history and maintain that until the car has exceeded 100,000 miles.
 

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Discussion Starter · #3 ·
:D
routemaster1 said:
WelshCacti03 said:
Hi everyone.

Last June I bought a 2015 c4 cactus 1.6 Blue HDI. It now has around 80k miles on the clock.

A couple of days ago the amber engine warning light went off. I have a Zus system on my car and the error code was P2207 NOx Sensor Heater Control Circuit High Bank 1. I took it to an independent garage who confirmed this was the same error code they were getting. They reset the warning light and it went off. Drove around for a couple more days and it has turned on again. The Zus system is giving the same error code.

I understand a NOx sensor replacement can be quite expensive so I have a few questions:

1. Does the sensor necessarily need replacing?
2. How much might I be looking at paying for parts/ labour?
3. Is there any relevant recall, emissions issue or extended warranty that could help to pay for this?
1. It may need replacing but it could be a wiring loom issue.
2. If Citroen replace it, it could be ~£400
3. There may be a wiring loom recall, IIRC there was a recall issue on C4 Picassos. Warranty will only pay if you actually have one. I would always recommend the Citroen extended warranty, which you can only get after 3 years if the car has a proper service history and maintain that until the car has exceeded 100,000 miles.
Thanks for that, it's really helpful! One last thing, until I get it done is it safe to use? I'm working tomorrow and would travel about 100 miles on the motorway if I drove.
 

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got the same issue been playing up for few months I've been clearing the code but think its time to get this sorted booked in at robins tomorrow although I've told them the code
they still need to do diagnostic @ £60 every half hour which is a joke I'm dreading the overall price .will post update tomorrow.
 

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No idea where you are but I have no confidence in Robins and Day after a number of issues with wrong dianoses and failure to fix with follow up when a local independant sorted the item for just a few pounds. Total bill from the indepenant was £30 and fixed the issue but R & D had the car three times for a total of 5 weeks and several hundred pounds with total failure to fix.
 

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just got back from robins so was the same fault i told them so they have quoted me NOx sensor and ecu download without pipe £525.86 with pipe £978.33 bloody ridicules. also need exhaust bracket welding quoted me £120
 

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Don't know where you are but my daughters exhaust bracket was welded back on by a local tyre firm for £20. And here http://c4owners.org/plugins/reviewer/reviewer.php you will find a list of independant Citroen specialists with reviews who will doubtless drastically reduce those costs. The one I refered to earlier was Bragg of Briston in Norfolk which will no doubt be too far for you I guess
 

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Yes - that will happen. It may not be the Nox sensor but can be a number of faults related to the Adblue system. One can be low Adblue in the tank. Perhaps worth checking your adblue tank and put some in if the level is low. Can't remember the minimum but it will be 3+ litres of adblue that it needs (see your handbook for amount and how to do it). It will then take the system a while to realise the level is increased and get rid of the message. Given the cost of adblue I usually put 10 litres in if this message is displayed - just over £9 from Screwfix, Toolstation or motor factors. Full tank is 16 litres I think and should last over 12000 miles
 

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IanHurley said:
Yes - that will happen. It may not be the Nox sensor but can be a number of faults related to the Adblue system. One can be low Adblue in the tank. Perhaps worth checking your adblue tank and put some in if the level is low. Can't remember the minimum but it will be 3+ litres of adblue that it needs (see your handbook for amount and how to do it). It will then take the system a while to realise the level is increased and get rid of the message. Given the cost of adblue I usually put 10 litres in if this message is displayed - just over £9 from Screwfix, Toolstation or motor factors. Full tank is 16 litres I think and should last over 12000 miles
There is no issue doing this. However, when Adblue is low the error message usual says 'Adblue low' or similar. In my experience, when topping up the error message disappears quickly, in my case just after the first start.
 

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I have forty litres of adiglu in my loft, I have a adiglu system on my Cactus. BUT.... I have not used it for over two years (as I filled it with water and adiglu mix, as adiglu is mostly water anyhow) recently as my warranty expired, I got the adiglu software removed from the CPU (and main relay and fuse) Never needed it, didn't really do much apart from swirt some watery ammonia mix into my link pipe in the exhaust. And guess what. Still runs, still smells the same, still has below 100Ppm (or whatever my yearly excise tax contribution exists of) still goes, no lights. No more goats piss urea. As Citroën (along with various other diesel engine manufacturers) only use this system to fool the fools at Fina or wherever.
How did people manage before adiglu systems and Dpf were fitted to diesel engines??
 

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Hi guys,

Just jumping on here with a query. Is it just the 15/16/17 models that have the dodgy NOx sensor. About to get mine replaced and was wondering if you guys have had any issues since you had it replaced. Citreon obviously don't care but i like my car but not if the sensor fault is an ongoing issue.

Many thanks
 
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