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Autopapyrus · Volvo V90 Cross Country D4 (2018)
https://autopapyrus.com/guides/volvo/v90-cross-country/glow-plug-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Volvo V90 Cross Country D4 (2018): Glow Plug Replacement

On the D4 diesel, glow plugs are needed for cold starting and for the pre-heating system to work. Replace them when a fault is confirmed: a fault code for the glow circuit, hard starting when cold, smoky starts, or the glow warning light. The exact access procedure for this engine is not described in detail in open sources, so what follows is a general procedure that you must check against the Volvo service information.

Difficulty: Medium Time: 2-4 hours Steps: 10 Tools: socket set and ratchet with extensions, low-range torque wrench, thin-wall glow plug socket (sized for your plugs), multimeter, plastic connector release tools, vacuum cleaner or compressed air, copper anti-seize for threads (optional), drain pan and rags.

Part

  • 🔩 Set of 4 glow plugs for the Drive-E 2.0 diesel (D4204T14), one per cylinder. Choose plugs from reputable manufacturers (Bosch, Beru/BorgWarner, NGK) made for this engine. I am not giving an exact part number to avoid getting it wrong: compare the new plug with the old one by length, tip shape and connector type

Step by step

10 steps
  1. Start with diagnostics. Read the fault codes with a scan tool and measure the resistance of each glow plug with a multimeter after unplugging the connector. A good plug shows low resistance, usually a fraction of an ohm. An open circuit or a noticeably higher reading means the plug is faulty. Also check the power supply and ground so you don't replace good plugs.
  2. Shut the engine off and let it cool down completely. Disconnect the negative battery terminal. On cars with Start/Stop and an auxiliary battery, follow the disconnection procedure specified for this model. After disconnecting, wait 10-15 minutes.
  3. Remove the decorative plastic engine cover. Remove the parts that block access to the top of the cylinder head: air ducts, hoses, and possibly wiring covers. Take photos of the position of hoses and connectors.
  4. Carefully disconnect the electrical connectors or the glow plug power rail. Press the locking tabs gently, because the plastic becomes brittle on a warm engine.
  5. Before unscrewing the plugs, clean the plug wells with a vacuum cleaner or compressed air. No dirt should get into the cylinder.
  6. Unscrew the plugs with a thin-wall socket, keeping it strictly in line with the plug axis and not at an angle. If a plug is tight, do not force it. First let penetrating oil soak in, then try turning it back and forth. A broken heating element or stripped threads in the head will require removing the cylinder head or special tooling, and in that case you need a repair shop.
  7. Compare the new plugs with the old ones by length and connector. Make sure the wells are clean and dry. Apply just a very small amount of copper anti-seize to the threads, keeping it off the heating element.
  8. Thread the new plugs in by hand until they stop, then tighten with a torque wrench. The torque for glow plugs is usually low, in the range of 8-15 N·m (6-11 lb-ft), but check the exact value for your plug against the Volvo service information and the plug manufacturer's data. Do not overtighten, or the plug will break.
  9. Reconnect the connectors or the power rail, reinstall the removed parts in reverse order, and reconnect the battery.
  10. Turn the ignition on for 10-15 seconds without starting the engine and make sure the glow warning light cycles correctly. Start the engine, check that it runs smoothly, and clear the fault codes with the scan tool. After 1-2 days of driving, check that no codes have returned.

Common mistakes and warnings

  • Replace the plugs only on a cold engine: a hot aluminum cylinder head increases the risk of stripping the threads or breaking a plug. If one plug has failed due to age, the others will most likely fail soon too, so it is best to replace the whole set. If a plug will not unscrew or has broken off, stop and take the car to a repair shop. Trying to dig out the remains of a plug without experience can end with fragments falling into the cylinder and an expensive repair.