Systematic circuit testing on an Audi Q2 displaying fault code 15652 leads Milligan Auto Diagnostics to uncover both a failed radiator fan and clearance issues with aftermarket replacement parts.
Using a Hella Gutmann Mega Macs S 20, the investigation began by pulling wiring diagrams for the engine cooling system before verifying 12V power supplies and ground integrity under load at the main four-pin multiplug.
A MixSig oscilloscope confirmed the engine ECU was correctly outputting its control signal to the fan, isolating the failure to the cooling fan assembly itself.
While an aftermarket fan was initially sourced, clearance issues against air conditioning pipework forced a switch to an £834 genuine TPS unit, highlighting the risk of non-OEM fitment on modern VAG cooling modules.
The video wraps up with a quick diagnostic on a Kia Niro, where a single shorted parking sensor pulled down the entire park assist network on the Kingbolen K8 Pro scanner.
