NOx Sensor Testing 

Many thanks, definitely more to follow.

Many thanks for the comment Paul. There will be plenty more Pico videos to follow.

Many thanks. Should be creating more videos soon.

Thank you.

Thank you 😊

You're welcome! Thank you.

You're very welcome.

Hi, there are a number of NOx/O2 sensor tester kits available in the market. My friend has one. I will find out the make and model and let you know.

Thank you! 😊

Hi there, what vehicle is it fitted to? Some 5 wire NOx sensors do no use the 5th wire. So they only have a positive, negative, CAN Hi and CAN Lo. Sometimes you can get downstream NOx sensor issues if the SCR catalyst is not performing as it should.

What an interesting question. I scraped a pass at Chemistry at school so take my answer as one not coming from an expert. In theory, yes, your commercial NOx sensor can measure in the region of 0-1600ppm. The term NOx that is used is only the collective term for Nitrogen Monoxide (Nitric Oxide) and Nitrogen Dioxide I believe. The iNO generator you have is this a respiratory machine? Have a look at this article I found about NOx sensors. There is a fair bit of reading in it but it discusses what the sensor is actually doing. dieselnet.com/tech/sensors_nox.php#:~:text=The%20NOx%20measurement%20range%20is,%C2%B110%20ppm%20%5B3899%5D%20.

Hello there. I haven't specifically seen the MAN 6 wire sensor, but I have seen 5 wire sensors which contain 2 earths, 1 positive and CAN High and CAN Lo. I will have a look out for one and do a video on it. Thanks for the question.

Hi, I would always recommend going for more channels if possible. This means you can measure power/ground and signal at the same time when you are looking at most sensors. Really depends on your budget. I have both, I started with the two channel which cost me £150 ($195). Relatively cheap, but got me used to using the software.

True, but what if it wasn't on the CAN. I had a NOx fault where the issue was a voltage drop on the earth. Loading the circuit at the sensor proved it. Comms issues are not always relating to comms wires.

Hi Neil. It's an Ancel X6 HD, they retail about £450.00 ($545.00). You get what you pay for with scantools. We haven't had any success with it on Iveco. DAF, engine and SCR faults but no ABS. Volvo, Renault, Dennis pretty good to be fair. The tool allows for 1708 CAN diagnosis which is helpful on these models.

@@trucktechtips638 Thankyou

Hi there. So there are a few things to consider. Firstly you need to make sure that the NOx sensor that you have fitted is the exact component for your vehicle. Different manufacturers may have CAN High and Low swapped round. Secondly are there any other DTCs stored? Do you have any for EGR for example. The EGR also assists with the reduction of NOx. If there is an issue with this system NOx levels will be higher than normal. Thirdly, does you vehicle have a pre and post NOx sensor or just a post NOx sensor. Potentially the SCR catalyst could be an issue although this is only in extreme cases. Just a few things to consider.

Thanks for the reply, problem solved. The problem was in the SCR catalyst. Thank you!