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Discussion Starter #1
Keep getting this fault code appearing, I can delete it with my COB2 reader but after a month or so it reappears.
I’ve taken it to a local Independant Vauxhall specialist but even they can’t identify the problem! They suggested only the main dealer could identify this fault code. It does not seem to affect performance or economy, any ideas?
 

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I've got exactly the same problem. My car is in its 4th year (16 plate) 47,000 on the clock. When it first happened on mine, I took it in to be fixed (extended warranty). The car supermarket didn't know what to do, so they sent it to Vauxhall. Vauxhall replaced a NOx sensor and messed about with the adblue system. £700 was paid through the warrenty but it didn't fix it!!!

Like you, the car runs well, has excellent mpg and other than the recurring monthly message doesn't cause any problems. I've decided to leave it as it is. It passes the MOT and if Vauxhall can't fix it, I'm going to stop worrying.

I would say also that this car has had a number of service upgrades to it's software. I suspect that in fixing one issue, it has created another. The p118b error points to the oxygen sensor, but since the car runs fine it's unlikely to be the issue. I've tried to find similar issues on the same engine in other Vauxhall models, but most use a lower powered version of the engine. I'm also guessing Vauxhall is now more interested in sorting out any issues with their new French 1.5 diesels rather than this unit.
 

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Discussion Starter #3
Thanks Dirk
I appreciate your reply as I took my vehicle in to an Independant Vauxhall ‘specialist’ who said that only Vauxhall had the capability of ‘drilling down’ into the codes any further in order to be specific about the problem. They were very accommodating and only charged me for the use of their diagnostic equipment even though they took the car in twice to try to identify the fault which they believed to be an oxygen sensor but did not want to risk replacing one at £100 plus only to find the problem was not solved. I have not had the car serviced at the main ‘stealers’ so have not had any software upgrades that could have thrown up the problem. The car is a 16 plate and now has 35000 on the clock and I bought it when it was 6 months old with 7000 on it. It’s still running fine and according to the MOT tester is still way within the emissions limits. It only seems to sip the adblue as I’ve only put in 10 litres since owning it, so like you I’m going to keep on rolling and keep the COB Reader (only a tenner on eBay) in the boot to keep knocking off the pesky little warning light!
 

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Our first error was p11cc. This was fixed with a Vauxhall service upgrade at about 30,000 miles. They said the car will use more Adblue. We seem to get about 6-7k to the 7 litre tank now. We've also had the p20ee code with the p118b code. Maybe that's why the replaced the NOx sensor. ??

Anyhow, don't waste time at Vauxhall until something goes wrong. I'm guessing the emission system monitoring is too sensitive on this engine which is creating these problems. A software upgrade that will probably never happen!
 

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Forgot to say, we tend only to get this error on long runs. When the car is running hot. A little research indicates that the NOx output is greatest when diesel cars are doing high speed motorway miles. Again, I suspect the emission monitoring software for this engine is way out of line and will always report errors under these situations.
 
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