Coupe fails its MOT
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Coupe fails its MOT
Took the Coupe for an MOT this afternoon and it failed on emmisions.
When the tester reved it I was looking at the numbers and all of a sudden they shot up they slowly came down but not enough. The car then ran lumpy and the tickover kept going up and down. It was as if something had opened and not closed as it was running fine before. Although the car settled down later it did it again on the way home.
Any ideas please?
When the tester reved it I was looking at the numbers and all of a sudden they shot up they slowly came down but not enough. The car then ran lumpy and the tickover kept going up and down. It was as if something had opened and not closed as it was running fine before. Although the car settled down later it did it again on the way home.
Any ideas please?
Re: Coupe fails its MOT
Coolant temperature sensor is the usual culprit on most Rover engines-probably a good place to start.
Kind Regards
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
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Re: Coupe fails its MOT
Would that cause the symptoms of the rough running etc that I have described?John W wrote:Coolant temperature sensor is the usual culprit on most Rover engines-probably a good place to start.
Re: Coupe fails its MOT
my cabby was running lumpy with loss of power even with my foot flat to the floor it turned out to be the cat the cat was rotten inside and the exhaust gasses could not escape quick enough just an idea
jon
jon
1997 218vvc tomcat tahiti blue
1994 216 cabby tahiti blue
1994 216 cabby tahiti blue
Re: Coupe fails its MOT
Yes it could, but of course other things could too, such as vacuum leaks/inlet manifold leaks etc.Jeff Turbo wrote:Would that cause the symptoms of the rough running etc that I have described?John W wrote:Coolant temperature sensor is the usual culprit on most Rover engines-probably a good place to start.
I treat the CTS as a service item and change them routinely.
Kind Regards
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
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- Forum User
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- Location: lincoln
Re: Coupe fails its MOT
You were spot on. Had to have the ecu re-set aswell but it was the coolant sensor playing up. Passed now with flying coloursJohn W wrote:Coolant temperature sensor is the usual culprit on most Rover engines-probably a good place to start.
Many thanks
Re: Coupe fails its MOT

Kind Regards
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
John
1994 216 SE Cabriolet
1993 Rover 827 Coupe
1999 Rover 820 Sterling auto
1964 2000 (P6)
1982 Porsche 924
1980 Ford Fiesta MK 1
1983 Ford Capri 1.6LS
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Re: Coupe fails its MOT
This is a really old post, but I am going to swap the ECU coolant temperature sensor on my 214 SEi shortly - however how does one "reset the ECU" as referred to above, and is this even necessary after changing the sensor?Jeff Turbo wrote: ↑Tue Oct 05, 2010 3:36 pmYou were spot on. Had to have the ecu re-set aswell but it was the coolant sensor playing up. Passed now with flying coloursJohn W wrote:Coolant temperature sensor is the usual culprit on most Rover engines-probably a good place to start.
Many thanks
Current:
1996-N 214 SEi, 2010 Volvo V50 2.0 SE Lux, 2015 VW Up!
Former:
214 SEi x3, 216 SLi, 216 Cabriolet, 416 GSi, 420 GSi Tourer, 25, 45, 75
1996-N 214 SEi, 2010 Volvo V50 2.0 SE Lux, 2015 VW Up!
Former:
214 SEi x3, 216 SLi, 216 Cabriolet, 416 GSi, 420 GSi Tourer, 25, 45, 75
Re: Coupe fails its MOT
Funnily enough my Turbo Coupe went in for the MOT test yesterday and we stopped at the test emissions due to high CO and lamda numbers...
Plugging a Crypton MAS tester into the diagnostics port came up with a coolant sensor fault flag, which I cleared and it didn't come back immediately, but I'm going to change the sensor anyway.
Will probably get a replacement lamda sensor too as I've only got a couple of weeks on the current ticket...
I think the MAS kit has the option to reset the ECU - I'll check. If safe to do so, I can probably post it to you if you're still in need
Plugging a Crypton MAS tester into the diagnostics port came up with a coolant sensor fault flag, which I cleared and it didn't come back immediately, but I'm going to change the sensor anyway.
Will probably get a replacement lamda sensor too as I've only got a couple of weeks on the current ticket...
I think the MAS kit has the option to reset the ECU - I'll check. If safe to do so, I can probably post it to you if you're still in need

I like Twin Cams.... and Single Cams...and now Turbos
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Re: Coupe fails its MOT
Thanks John - I had a bit of a battle getting my car through the emissions during the MOT in July. I had the lambda changed and a new cat, but it was still touch and go. I didn't change the ECU temperature sensor so I'm thinking this is the way to go.GTiJohn wrote: ↑Thu Aug 08, 2024 6:54 am Funnily enough my Turbo Coupe went in for the MOT test yesterday and we stopped at the test emissions due to high CO and lamda numbers...
Plugging a Crypton MAS tester into the diagnostics port came up with a coolant sensor fault flag, which I cleared and it didn't come back immediately, but I'm going to change the sensor anyway.
Will probably get a replacement lamda sensor too as I've only got a couple of weeks on the current ticket...
I think the MAS kit has the option to reset the ECU - I'll check. If safe to do so, I can probably post it to you if you're still in need![]()
It's in an awkward spot so I'm thinking of getting the garage to do it as I think the coolant will need draining as the sensor looks in a too difficult spot to do it quickly (i.e. get the socket in and the sensor in and out speedily without losing too much coolant).
Current:
1996-N 214 SEi, 2010 Volvo V50 2.0 SE Lux, 2015 VW Up!
Former:
214 SEi x3, 216 SLi, 216 Cabriolet, 416 GSi, 420 GSi Tourer, 25, 45, 75
1996-N 214 SEi, 2010 Volvo V50 2.0 SE Lux, 2015 VW Up!
Former:
214 SEi x3, 216 SLi, 216 Cabriolet, 416 GSi, 420 GSi Tourer, 25, 45, 75