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BMW Spark Plugs and Ignition Coils: When to Replace and What It Costs
On the N55, B48 and B58, spark plugs are the scheduled item and appear as a service reminder, while ignition coils only need replacing if they fail or test bad, and owners say the job is short on a B58 with the right socket; we do not state a mileage interval because our sources do not give one.
Last updated · By BimmerQuote (how we build guides) · Costs on this page come from the linked repair pages, each citing its sources.
Plugs are scheduled, coils are not
The N55 page lists a spark plug service reminder, misfire codes and rough idle, and says several commenters call coils not a wear item. The B58 and B48 page lists a CBS spark plug reminder and says coils only need replacing if they fail or test bad. Our sources do not give a sourced mileage interval by engine, so we leave that out; the cluster reminder is the trigger. See Spark Plugs & Ignition Coils (N55) and Spark Plugs & Ignition Coils (B58 / B48).
A shop owner says they bill 1 to 2 hours depending on four or six cylinders. For a DIY N55 job it is an afternoon, and the strut brace and intake pipe may need to come out. On the B58 the plugs are near the top of the engine, and owners call it a short job with the right socket.
Getting a fair quote
Dealer plug quotes are common in the B58 sources, and the page says to get an independent quote for comparison. The N55 page also warns that a high dealer bill in one thread was plugs and coils on a V8, so it is not counted. Ask whether coils are in the quote and why. Bosch coil 12138643360 fits the B46, B48 and B58 per the page.
Our sources describe a service reminder for plugs on the N55, B48 and B58, but do not give a sourced mileage interval, so follow the reminder or ask a dealer.
How much does it cost to replace BMW spark plugs on an N55?
Spark Plugs & Ignition Coils (N55) on a BMW with the N55 engine typically costs $250–$1,200 at an independent shop, $650–$1,500 at a BMW dealer, or $150–$480 in parts DIY, based on 8 real owner-reported prices.
How much does it cost to replace BMW B58 spark plugs?
Spark Plugs & Ignition Coils (B58 / B48) on a BMW with the B58/B48/B46 engine typically costs $950–$1,000 at a BMW dealer or about $269 in parts DIY, based on 3 real owner-reported prices.
Should I replace the coils with the plugs?
Commenters say no unless a coil fails or tests bad.
Where this comes from
Every cost on this page is pulled from these repair pages, which list the price, the forum or shop source and the details for each report. This guide adds no prices of its own.
