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Understanding how faults affect gas emission levels

By autotech-nath on August 4, 2018

Delphi Technologies does not make a song and dance about its technical training and it could perhaps be the firm’s best kept secret! Courses take place at a bespoke facility in Warwick, are open to all and are conducted in small groups of up to six, providing half the content within the classroom and the other in the workshop. Autotechnician was invited to a ‘walk through’ of its Understanding Emissions course, which provides a thorough overview of exhaust gas values and their relationships, catalytic converter operation and diagnosis, and how to interpret emissions values to get to the bottom of engine management faults.

It was a real eye opener and course trainer Jon, who has spent the last 28 years repairing petrol and diesel systems, explained that people assume you don’t need to know the basics anymore since the introduction of the closed loop system, but he insists this is simply not the case, suggesting workshops are not using their emissions analysers to their full potential. Understanding the emission values and the process involved can give clues to problems elsewhere and a quick probe up the exhaust will prove various problems such as misfires and air leaks.

Candidates should have a good understanding of engine management systems and diagnostic procedures and be familiar with a 4-gas analyser. Even if you’ve been in the trade for years, you’re sure to have some knowledge gaps plugged with this one.

A master tech attended this course, having failed the emissions part of his ATA. It took him the full day to get to grips with it all but went on to attain the ATA and confidently fix problems that had been highlighted in the course.

To find out more about its training programme, visit



About Autotechnician
Autotechnician is a magazine published nine times a year, delivering essential information to independent garage owners and technicians in the UK. Delivered both digitally and in print, autotechnician provides readers with technical, training, business advice, product and news, allowing our readers to keep up to date with information they need to run and work within a modern workshop.
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