Corrections and data changes
Last updated: October 19, 2026
Report an error
If you think something on this site or in a report is wrong (a figure, a source, a model year, a part number or a recall), email [email protected]. Please include the page or report ID, what you think is wrong and, if you can, a source. Owners, shops and technicians are all welcome to write in.
Our correction commitment
- We read every error report and reply, normally within 5 business days.
- If we confirm an error, we fix it on the site and in the report data, and we log the change below with its date. We don't quietly edit figures.
- If the error affected a report you bought, we'll reissue the corrected report to you free. You can still ask for a refund under the Terms.
- Where we can't confirm a claim either way, we say so and keep the figure labeled ESTIMATE, or we remove it.
Data change log
- Oct 19, 2026: timing-chain mileage analysis added. The home page now shows a timing-chain mileage chart, and reports add a timing-chain page with model-year complaint shares. These figures are computed by RepairAhead from NHTSA's bulk complaint file (NHTSA has not reviewed or endorsed this analysis). BMW bulletin citations now point to the copies posted on NHTSA's site.
- Oct 18, 2026: N20 complaint count corrected from 2,088 to 1,726. NHTSA's complaint search groups some trims together (for example, "X3 xDrive28i" also returns xDrive35i and diesel complaints, and MY2012 "328i" includes cars with the older N52 engine). We decoded each complaint's partial VIN and kept only those that decode to an N20 engine: 1,726 of the original 2,088 (MY2012–2015). The timing-chain, water-pump and fire counts were recalculated the same way.
- Oct 18, 2026: 320i model years corrected to 2013–2016. The VIN checker had accepted a 2012 320i. NHTSA's VIN decoder lists no US 320i for MY2012, so the site and report now cover the 320i for MY2013–2016 only.
Sources for these figures are listed under "Key sources" at the bottom of the home page and in each report.