Non - 75 query (Rover 45)

ballymenaman · 4th October 2016, 19:31

My 75 is currently off the road so I thought I'd MOT my 1.4 45, which has been sitting on SORN for a year.

Failed on emissions - namely, a CO reading of 7.22% vol - over twice the legal limit. The HC reading was ok at 327 ppm.

Is driving fine but the engine check light is on (not flashing though - the handbook says it is ok to drive with it like that). Plugs, leads, air filter, coils etc all in good order.

Any suggestions why it has failed?

Stickman · 4th October 2016, 19:34

Lambda sensor

Regards
Chris

Davey1991 · 5th October 2016, 13:30

Possibly catalyst failing

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Plezier · 6th October 2016, 08:10

If it were me I would replace both CAT and Lambda sensor.

SD1too · 6th October 2016, 19:14

Quote:

Originally Posted by ballymenaman

... my 1.4 45, which has been sitting on SORN for a year.

Andy,

Did it pass the MOT on emissions prior to SORN? If so, I'd start by checking the electrical connections in the lambda sensor circuits. When cars lie idle for extended periods the electrics become damp or the contacts become degraded.

Simon

ballymenaman · 7th October 2016, 15:24

Stuck a new pre-cat lambda sensor in and checked the inlet manifold nuts. One was a tad loose. Don't know which sorted the problem but the 45 passed its retest today. CO down to 0.4% and HC to 37ppm. Hurrah!

4th October 2016, 19:31	#1
ballymenaman Avid contributor 75 Contemporary SE 2.5 V6 Auto, Rover 45, classic mini and E Niro Join Date: Oct 2012 Location: Ballymena, Northern Ireland Posts: 239 Thanks: 25 Thanked 19 Times in 17 Posts	Non - 75 query (Rover 45) My 75 is currently off the road so I thought I'd MOT my 1.4 45, which has been sitting on SORN for a year. Failed on emissions - namely, a CO reading of 7.22% vol - over twice the legal limit. The HC reading was ok at 327 ppm. Is driving fine but the engine check light is on (not flashing though - the handbook says it is ok to drive with it like that). Plugs, leads, air filter, coils etc all in good order. Any suggestions why it has failed?

6th October 2016, 08:10	#4
Plezier I really should get out more....... Mercedes C Class CDI estate (2003) Join Date: Sep 2012 Location: Gradina Posts: 2,652 Thanks: 62 Thanked 137 Times in 119 Posts	If it were me I would replace both CAT and Lambda sensor. __________________ Classic SE CDT sadly lost in a severe collision.

4th October 2016, 19:34	#2
Stickman Posted a thing or two Rover 75 saloon Join Date: Nov 2012 Location: Bordon Posts: 1,856 Thanks: 250 Thanked 403 Times in 352 Posts	Lambda sensor Regards Chris

5th October 2016, 13:30	#3
Davey1991 Avid contributor MG ZT Join Date: Sep 2016 Location: Bingham, Nottingham. Posts: 240 Thanks: 66 Thanked 39 Times in 28 Posts	Possibly catalyst failing Sent from my D5803 using Tapatalk

7th October 2016, 15:24	#6
ballymenaman Avid contributor 75 Contemporary SE 2.5 V6 Auto, Rover 45, classic mini and E Niro Join Date: Oct 2012 Location: Ballymena, Northern Ireland Posts: 239 Thanks: 25 Thanked 19 Times in 17 Posts	Stuck a new pre-cat lambda sensor in and checked the inlet manifold nuts. One was a tad loose. Don't know which sorted the problem but the 45 passed its retest today. CO down to 0.4% and HC to 37ppm. Hurrah!