DTC P0401 Volkswagen, Audi, Skoda and SEAT (P040100): EGR Flow Insufficient, Causes and Fix
P0401 (P040100 on VW-group scans, 16785 in older VCDS logs) means the engine control unit opened the EGR valve to…
DPF Replacement Cost by Car: What a New Filter Costs, and When a Clean Will Do
In the UK in September 2026, DPF replacement cost is £600 to £1,200 fitted with a good aftermarket filter, £1,200…
DTC P0299 Volkswagen, Audi, Skoda and SEAT (P029900): Turbo Underboost, Causes and Fix
P0299 means your turbo isn't giving the engine the boost it asked for. Your car noticed the shortfall, stored the…
OBDeleven Credits: Prices, How Many You Need, and Where to Buy Them
OBDeleven credits (you'll also see them written OBD11 credits) are the in-app currency that pays for One-Click Apps, the ready-made…
OBDeleven Plans Compared: Free vs PRO vs ULTIMATE, Which Do You Need?
OBDeleven plans come in three. Free, which every device comes with, reads every module, shows live data and clears faults,…
DTC P2102 Volkswagen, Audi, Skoda and SEAT (P210200): Throttle Motor Circuit Low, Causes and Fix
A DTC P2102 Volkswagen, Audi, Skoda or SEAT fault means the wire that powers your throttle motor is touching metal…
1.0 TSI Engine Problems: What Fails, When, and What It Costs
Most 1.0 TSI problems trace back to one habit: short journeys. The list is short, and in rough order of…
LTFT B1 Normal Range at Idle: Long Term Fuel Trim Explained
Long term fuel trim is the correction your engine computer has learned to apply to the fuel map to keep…
VW Limp Mode on Golf, Polo, Jetta, Tiguan and Passat (and Skoda, SEAT): Why It Happens and How to Get Out of It
VW limp mode means the car is protecting itself. When the engine computer sees a fault it does not trust,…
DTC P2101 on Volkswagen, Audi, Skoda and SEAT (P210100): What It Means and How to Fix It
DTC P2101 on a Volkswagen, Audi, Skoda or SEAT means the engine computer told the throttle motor to move the…