Second Hand Alfa Romeo 147 Glow Plugs

Glow plugs are a diesel-only component — they pre-heat the combustion chamber to aid cold starting on compression-ignition engines. The 147 was sold in the UK with petrol engines (the Twin Spark and GTA V6 units) and diesel engines (the 1.9 JTD and Multijet variants), so only the diesel-engined cars have glow plugs at all. If your 147 is a petrol, you will not find glow plugs on it and the equivalent ignition component you may be looking for is spark plugs.

The Alfa Romeo 147 ran from 2000 to 2010, with a facelift introduced in 2005 that updated the styling and brought in revised Multijet diesel engines alongside the earlier JTD units. Because the glow plug spec follows the engine code rather than the model year or facelift date, a plug from a pre-facelift 1.9 JTD may not be the same part as one from a post-2005 1.9 Multijet even though the displacement sounds identical. Confirm the engine code from your V5 or a VIN check and route the cross-facelift interchange question to the breaker so they can verify against your specific registration.

Engine code matters far more than year and engine size alone — Alfa used different JTD and Multijet variants across the 147's life that can share the same 1.9-litre badge but use different glow plug specifications. The engine code is stamped on the engine itself and appears on your V5 registration document or via a HPI/VIN check. Always supply the engine code to the breaker when requesting a quote, as it is the single most reliable way to ensure you get the correct plugs.

Trim level makes no difference to glow plug fitment — Progression, Lusso, and Veloce are specification packages affecting interior equipment, alloy wheels, and cosmetic features, not the engine. What determines plug compatibility is solely the engine code shared between those trim levels. As long as the donor and recipient cars carry the same engine code, the glow plugs will be the same part regardless of which trim either car is badged as.

A four-cylinder diesel engine — which covers both the 1.9 JTD and 1.9 Multijet units fitted to the 147 — has one glow plug per cylinder, so you will need four plugs in total. When sourcing from a breaker, bear in mind they will typically sell individual plugs pulled from a donor engine, so confirm how many you need before agreeing a price. It is generally advisable to replace the full set rather than a single plug, as the others will be of the same age and condition.

It is plausible that some glow plug part numbers cross over between Alfa models sharing the same engine family, as the plug specification follows the engine code rather than the car it is installed in. However, Alfa fitted various JTD and Multijet calibrations across different models and production years, so you should not assume compatibility without checking engine codes on both vehicles. Confirm the cross-model interchange with the breaker against both registrations before purchasing.