Is your N20 BMW a timing-chain or water-pump bill waiting to happen?

In the US, the N20 (and its low-emissions twin, the N26) is the 2.0L turbo four in the 2012–2016 328i, 2013–2018 320i (incl. xDrive), 2014–2016 228i and 428i, 2012–2016 528i, 2012–2015 X1 sDrive/xDrive28i, 2013–2017 X3 28i, 2015–2018 X4 28i, 2012–2016 Z4 sDrive28i, and the 2016–2018 X5 xDrive40e plug-in hybrid. Watch out: the 2012–2013 E90-generation 328i, the early 2012 X3 28i, and the 2016+ X1 28i use different engines. The VIN check above sorts this out for most cars.

BMW updated the N20 timing-chain parts during 2015, but its two bulletins draw different lines. SI B11 02 21 (the class-settlement coverage) covers cars built through February 2015. The earlier SI B11 03 17 (Rev. 7) chain warranty extension lists production dates as late as July 2015 for some models (March 2015 for the X3 and X4). The VIN doesn't record the production month, so look at the label in the driver-side door jamb, which shows the month and year of manufacture (e.g. 11/14). Built 02/15 or earlier: original design. Built from 03/15 to the model's latest Rev. 7 date: uncertain, so ask a BMW dealer to check by VIN. Built later, or model year 2016+: likely revised parts, but BMW doesn't confirm that for any one car. Model year 2012–2014 cars are all original-design. A chain that has already been replaced (check the service records) changes the picture.

Owners most often report a whine or whir from the front of the engine that rises with RPM, especially when cold. If you hear it, have a qualified BMW shop check chain stretch and guide wear as soon as you can, and avoid hard driving until then; a chain can fail without further warning. This page can't diagnose your car.

Yes. Safety recall repairs are free at BMW dealers. Under 24V-608, dealers inspect the electric water pump's connector and replace the pump or connector if needed, and fit a protective shield. Confirm whether your specific VIN has the recall open at nhtsa.gov/recalls or with a dealer.

Probably not. BMW's extended coverage applied to 2012–2015 N20 vehicles built through February 2015, generally up to 8 years / 100,000 miles from the in-service date, with only partial reimbursement above 70,000 miles. By 2026 nearly every covered car is past 8 years. If you paid for a chain repair inside the coverage window and never claimed, or you're unsure, ask a BMW dealer to check your VIN.

They're estimated repair costs at independent shops, taken from published shop quotes, retailer part prices and owner reports. Every figure is labeled by source type (Official, Shop/retailer or Forum/blog) or as our Estimate, and retailer prices carry the date we checked them. Dealers often charge 1.5–2× more, and prices vary by region. Get a written quote before any work.

No one can promise that. Replacing known weak parts early can lower your exposure to some expensive failures, but parts can still fail, and other things can go wrong. The "if it fails" numbers are reported failure ranges for repair bills, not predictions.

A personalized PDF built from your VIN and mileage. It includes a build-date chain assessment, every NHTSA recall listed for your model year plus a recall checklist for the dealer, a mileage-based plan with estimated repair costs and part numbers, a pre-purchase inspection script, and fair repair-cost ranges with, for shoppers, a negotiation helper based on those estimates (owners get a resale helper; neither is a valuation of the car). It's in development and not for sale yet; join the list to hear when it launches. When it launches, reports are delivered by email within 24 hours of purchase; if yours isn't, you can get a full refund. Within 30 days of purchase, you can also ask for a full refund for any reason, no questions asked.

No. The VIN check runs in your browser and sends the VIN only to NHTSA's public vPIC decoder and recall API; we don't store or log it. (If you open a shared link that contains a VIN, our host, Cloudflare, receives that address as part of the request; the page then removes it from the address bar.) If you sign up after a check, we save only the decoded model (for example "2014 BMW 328i") with your email. The paid report is different: when it launches, you enter your VIN, mileage and optional build month on our order page, and we store them with your email to produce and deliver the report. Stripe handles the payment and receives your email and payment details, not the VIN. We don't sell it, and we delete it on request. See the privacy policy.