Hi everyone, Hoping someone can help me with a diagnosis. Had an EML come up on my 2005 CLK 200 recently. Read the code with my cheap reader and it’s showing 2 codes, “NA” and “P170”. Took the car for MOT today and it’s failed on CO2 emissions at 2%, all the rest were fine. Any ideas where I should be troubleshooting? Car’s been fault free for over a year!