Used Car Buying and Buyer Protection

BMW M57 Engine Buyer's Guide: 525d, 530d, 535d Faults

M57 vs M57N vs M57N2 across E60/E61. Swirl flap delete, twin-turbo wastegate on the 535d, ZF 6HP mechatronic. Five OBD2 checks before 3,000-12,000 EUR.

May 26, 2026

11 min

Used VW Golf TDI Buyer's Guide: PD, EA189, EA288 and Faults

1.9 PD vs 2.0 TDI CR EA189 vs EA288 across Mk5/6/7/8. Dieselgate fix legacy, DSG mechatronic, DPF on short trips. Five OBD2 checks before 5,000-22,000 EUR.

May 25, 2026

Used Audi A4 2.0 TDI Buyer's Guide: B8 vs B9, Quattro and Faults

EA189 B8 dieselgate legacy, EA288 B9, S tronic mechatronic, Quattro Haldex sludge. The 5 OBD2 checks before you pay 9,000 to 35,000 euros for a used A4 TDI.

May 22, 2026

Used Mercedes Sprinter Buyer's Guide: OM651 Faults, AdBlue, DPF

OM651 balance shaft wear, injector failures, AdBlue countdown, DPF on stop-start duty. The 5 OBD2 checks before you pay 8,000-45,000 EUR for a used Sprinter.

May 19, 2026

11 min

Used BMW 320d Buyer's Guide: N47 vs B47, Faults and OBD2 Checks

N47 rear timing chain vs B47 front chain. ZF 8HP mechatronic. DPF, EGR, AdBlue. The 5 checks before you pay 8,000 to 28,000 euros for a used BMW 320d.

May 16, 2026

VW Passat 2.0 TDI Used Buyer Guide: DPF, DSG and Faults

EA189 vs EA288 vs EA288 evo. The dieselgate fix that still matters. DSG mechatronic, DPF, AdBlue and the five checks before you pay 8,000 to 22,000 euros.

May 13, 2026

Used Nissan Leaf: Battery Bars, SOH and Common Faults

Twelve battery health bars, the LeafSpy SOH number, and the four faults that kill resale on a used Leaf. What to check before paying 5,000 to 22,000 euros.

May 9, 2026

Used BMW i3 Buyer's Guide: Battery Health and Range Check

Three battery generations, REX quirks, and four OBD2 checks that separate a healthy used BMW i3 from a tired one. Before you pay 8,000 to 28,000 euros.

May 6, 2026

Tesla BMS Error Codes: A Used Buyer's Decoding Guide

BMS_w015, BMS_a067, BMS_u029 and the rest. What each alert means on a used Model 3, S or Y. Range loss patterns and the four codes that mean walk away.

May 2, 2026

AdBlue Tampering: A 5-Minute OBD2 Check Before You Buy an EU Diesel

An AdBlue emulator or SCR delete is invisible on the dashboard but obvious in OBD2 live data. Five minutes during the test drive separates a real Euro 6 from a faked one.

April 28, 2026

EGR Delete Detection: What OBD2 Will (And Won't) Show on a Used Diesel

EGR deletion is the hardest of the three diesel emissions cheats to detect with OBD2. Here is what the scan tool reveals, what it cannot, and three physical checks that close the gap.

April 23, 2026

How to Spot a Deleted DPF on a Used Diesel Before You Buy

A removed diesel particulate filter is illegal across the EU and costs EUR 1,500 to 3,500 to refit. Six checks (three visual, three OBD2) catch it before you pay.

April 18, 2026

How to Check a German Used Car With OBD2 Before You Buy It

A 15-minute pre-purchase OBD2 scan tells you most of what the seller of an imported German used car would rather you didn't ask. Here is the exact checklist.

April 12, 2026

Is It Safe to Drive with the Check Engine Light On?

Your check engine light just came on. Can you keep driving? The answer depends on what the light is doing and how the car feels. Here is how to tell the difference between 'get it checked this week' and 'pull over now.'

March 18, 2026

7 min

Odometer Fraud: How to Detect Mileage Rollback (2026 Guide)

Odometer fraud costs EU buyers billions annually. Learn how to detect mileage rollback using physical evidence, OBD2 scans, and vehicle history checks before you buy.

September 19, 2025

14 min