Vauxhall Signum fault codes - what do they mean?
I own a Vauxhall Signum diesel 2006 plate. The engine management lights keeps coming on when I floor it or press down quick on the accelerator. The car/spanner light comes on at other times but not together.
I've taken it to a local garage and the fault codes P0023 and P0400 and P0235 come up. I have paid out money for the codes to reset and the problem hasn't gone away.
I took it to a diesel specialist and they can't pinpoint what's wrong. Changed mass air flow sensor and new diesel filter and air filter. Cleaned with EGR valve cleaner about four times. Not much change. Taken EGR valve out and cleaned. Not much change ether. Any ideas?
I've taken it to a local garage and the fault codes P0023 and P0400 and P0235 come up. I have paid out money for the codes to reset and the problem hasn't gone away.
I took it to a diesel specialist and they can't pinpoint what's wrong. Changed mass air flow sensor and new diesel filter and air filter. Cleaned with EGR valve cleaner about four times. Not much change. Taken EGR valve out and cleaned. Not much change ether. Any ideas?
Asked on 18 May 2015 by Martin signum 3.0ltr
Answered by
Honest John
This engine was also fitted to SAAB 9-5s and they are infamous for EGR related problems: www.honestjohn.co.uk/carbycar/saab/9-5-1997/?secti...d
Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.
The Good Garage Guide
Our Fuel Cost Calculator shows you which will be the best choice for you.
Compare the running costs of petrol, diesel and electric cars to make the right choice for you.
Similar questions
I have a 2004 Chrysler Voyager diesel auto, which I've owned for three months. It seemed fine, until recently, when it started making a clonk noise and stalling under heavy acceleration. Two fault codes...
I'v owned a Peugeot 206 2.0-litre diesel (2004 model) for a couple of years. The engine management light came on within an hour of me buying the car but I just ignored it as it didn't seem to affect the...
I have a 2003 Nissan Micra 1.2 that has recently been giving trouble. At first, it was just kangarooing for 30 seconds after moving off, then it got worse and would do it for maybe a minute or two. More...
Related models
.jpg?width=115&height=75&rmode=crop)
Plushly equipped alternative to an executive saloon. Versatile rear seating, stacks of room and some decent engines. Cheap to buy.
Elsewhere on 
