58 Each issue, in partnership with DiagnoseDan TSB (DDTSB), we’ll give you a real-world diagnostic challenge. Study the evidence, work out what’s really going on and tell us what you think is causing the fault. Get it right and you could earn something money can’t buy: an Aftermarket Troubleshooter mug. Yes, a mug. But not just any mug. These are won, not bought and are only available to winners of the Aftermarket Troubleshooter quiz. So when it appears on your toolbox, desk or tea round, everyone in the workshop will know you’ve earned it. And there’s more than bragging rights at stake. Each issue’s winner will also receive a six-month subscription to the DDTSB technical bulletin database, (www.diagnosedan.com) worth €230 + VAT. The new Troubleshooter quiz In partnership with DiagnoseDan TSB Think you know your diagnostics? Put your fault-finding skills to the test with the Aftermarket Magazine Troubleshooter quiz. The Urea level is adequate, and no external crystallisation or leakage is found. With the ignition ON, scan-tool live data shows 4.0 bar. With the engine at operating temperature, a mechanical pressure gauge is connected between the Urea supply line and injector. The technician activates “DeNOx system pressurization control.” Pressure reaches 6.0 bar, but once the pump stops it drops to 3.2 bar within 3 minutes. During the lower part of the pressure drop, scantool live data remains fixed at 4.0 bar. What should the technician do next? A. Replace the Urea tank due to a faulty internal pressure sensor. B. Disconnect the pressure gauge from the Urea injector, block one pipe connector on the gauge, so it remains connected only to the pipe from the tank and repeat the pressure test. C. Replace the Urea tank/pump because the pressure drop confirms an internal leak. D. Perform “Reinstallation of DeNOx System Fault” before carrying out further pressure testing. Think you’ve cracked it? Enter the Aftermarket Troubleshooter quiz online at tinyurl.com/ATQ112026 Entries for this issue close at11.59pm on 30 November 2026. We’ll reveal the correct answer on the Aftermarket website shortly after entries close, together with an explanation of the diagnosis. The answer will also appear in the next issue of Aftermarket, and the winner will be contacted by email. Competition terms One entry per person. The competition closes at 11.59pm on 31 October 2026. One winner of an exclusive Aftermarket Troubleshooter mug and a six-month subscription to the DDTSB technical bulletin database worth €230+VAT will be selected at random from all correct entries received before the closing date and contacted using the email address supplied with their entry. No cash alternative is available and prizes are non-transferable. The editor’s decision is final. By entering, entrants agree to their name and/or business name being published in Aftermarket and on the Aftermarket website if selected as the winner. Full competition terms and conditions are available on the Aftermarket website. This issue’s challenge A 2018 Peugeot 3008 1.5 BlueHDi arrives with the Urea warning light illuminated and“No start in 1000 km”displayed. The ECM stores P20E8 00 – Urea Fluid Pressure too Low. November 2026 ǁǁǁ͘ ĂŌ ĞƌŵĂƌŬĞƚŽŶůŝŶĞ͘ ŶĞƚ Did you get last month’s challenge correct? The answer was B) Faulty downstream NOx Sensor 2 over-reading actual ppm. Visit tinyurl.com/ATQ1026 to read the DiagnoseDan TSB the question was based on
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