Save time, by checking a component before removing it: this feature examines how to diagnose spark and glow plugs, plus exhaust gas temperature and O2 sensors
Diagnosing makes life easier While it is not the best of ideas to renew engine electrical components without prior investigation, some parts are fairly tiresome to remove, leading Rob Marshall to quiz NGK further about non-invasive diagnosis methods
IGNITION
Adopting a detective role within the cost and time pressures of a workshop environment is not always easy. While replacing parts blindly may yield a solution if you are lucky, it is quite different to substitute a known good component temporarily as part of a logical diagnostic process – a technique that many experienced technicians (and even technical trainers) advocate. However, not all components are that easy to access, meaning that extracting it needlessly could complicate the task if you run into trouble. So, what can you do?
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