In need of cleaning of EGR or DPF regen? ................ many people here complaining of similar hassles ........... lots of posts on the subject.


Possibly best to hang a CLIP or some such off it and see what the actual measured back pressure is and take it from there

 

Check the rubber pipe(s) coming off the DPF, one could be split..

 

Hoses are fine, was replaced with sensor.
Car stays in restricted performance.
Cleaned EGR
Now getting lambda sensor fault code.....
Unplugged the boost pressure sensor.
Car runs fine now, but MIL obviously stays on.
........

 

So the EGR is/was involved somehow then? Your cleanup job - did you also clean the exhaust pressure sensor, its tube/s and the connection/s on the exhaust side (checked for blockages) .


What is the exhaust pressure sensor and MAP reading with the engine not running, and what is the pressure differential on the exhaust pressure sensor with the engine off?

 

Any resolution or news?

 

This error can be caused due to multiple reasons, I recommend reading this blog P0470 P0471 P0472 P0473 and P0474 Exhaust Back Pressure Sensor Error Code Explained, they have mentioned multiple causes and a few methods to fix the errors. I hope it will help you.

 

I got that 0470 code all the time on my 2011 2.5L 4wd Koleos.. as directed, I replaced the O2 sensor and tried 4 different top quality sensors.. none ever solved the problem. It ended up being a defective main ECU module. For years, it was making the whole engine run terribly, belching thick black sulphur smelling rotten egg smoke.. I bought it for almost nothing due to previous owners giving up on it. So I bought a cheap $100 used ECU from the wreckers, my local ECU guy de-soldered the two security chips and swapped them both over so the new ECU would work. This solved the problem entirely. For the last three years, the car has run like a new car, and is a joy to drive. Hope that helps someone..

 

I replaced a differential pressure sensor on a 1.5dci once (pipes as well) but the fault kept coming back. The solution was to use Clip to set the baseline offset value as apparently the sensors are not all perfect even when new. Turned out the offset was zero but even so, the fault would not stay cleared until this process was done via Clip.