P229F Again !!

[DAMO71]

Hi There
It seems that I’m cursed by the dreaded P229 error code. EML came on a few months ago, NOx sensor was replaced by main dealer. A month later it came back on, main dealer said it wasn’t the sensor but the seal on the ad blue, replaced. Then on Monday it came back on after a trip on the motorway. So now I’m at a loss as to what else is causing the error.
It’s a 2015 C-Class 220d bluetec with 77k on the clock.

 

[OneForTheRoad]

Find a remapper that does ad blue solutions, would be my next move . It could get very expensive and for what ?? A 1% drop in nox emissions.

 

[DAMO71]

Find a remapper that does ad blue solutions, would be my next move . It could get very expensive and for what ?? A 1% drop in nox emissions.

Thanks for the advice, would a remap on the ad blue damage the car ?
Also, does this affect the MOT?

 

[Tonygw]

Doesn't affect the MOT which is nice, but make sure it is done properly by a reputable mapping company, not a guy off face book.

Worth doing if you are having problems.

 

[OneForTheRoad]

Thanks for the advice, would a remap on the ad blue damage the car ?
Also, does this affect the MOT?

No its simply deleted from the ECU. , but as mentioned pay a recognised provider. Especially if you have a regenerative dpf.

 

[Jobsworth]

There are two NOx sensors, one before the SCR catalyst and one after. This code refers to the one after. Which sensor was replaced the first time?

The second sensor monitors the performance of the adblue injecor and SCR catalyst. I would also pull out the adblue injector and make sure the hole isn’t blocked with white crystals

 

[DAMO71]

No its simply deleted from the ECU. , but as mentioned pay a recognised provider. Especially if you have a regenerative dpf.

What are the issues with a regenerative DPF, do all diesels not regen?

 

[OneForTheRoad]

What are the issues with a regenerative DPF, do all diesels not regen?

Cars that use ad blue on early software deletes the dpf didn't see ad blue and wouldn't re gen. Modern ad blue delete software has been rewritten to combat this . Some early dpf's were just catalytic soot catchers , they didn't burn off soot at something like 2000 degrees like modern euro 6 engines do.

 

[DAMO71]

Cars that use ad blue on early software deletes the dpf didn't see ad blue and wouldn't re gen. Modern ad blue delete software has been rewritten to combat this . Some early dpf's were just catalytic soot catchers , they didn't burn off soot at something like 2000 degrees like modern euro 6 engines

How modern is the Modern ad blue delete software?
I’m hoping that’s what the remapping guys are using today !?

 

[OneForTheRoad]

How modern is the Modern ad blue delete software?
I’m hoping that’s what the remapping guys are using today !?

2024 now . Ad blue was around in 2015. . Id imagine your car is euro 5 . So won't be an issue.