The customer reported that the check engine light was illuminated. A scan tool was utilized, revealing a code P0400-00, which indicated a problem with the Exhaust Gas Recirculation (EGR) Valve “A” Flow. Live data monitoring during a test drive confirmed that the EGR valve was not functioning properly. A visual inspection showed no visible faults, and further checks indicated the wiring harness was intact. However, when the EGR valve was removed and tested with jumper wires, it failed to operate as expected. As a result, the faulty EGR valve was replaced, leading to successful resolution of the issue.

The customer reported that the check engine light was on in their 2020 Skoda Kodiaq 1.5l petrol. A scan tool revealed a fault code indicating an intake air system leak. Using a smoke machine to test the intake system, no smoke was detected from the positive crankcase ventilation (PCV) valve. However, further tests showed that the PCV valve was leaking as it failed to retain vacuum. To resolve the issue, the PCV valve was replaced, and after clearing the codes and conducting a road test, the vehicle operated properly with no illuminated check engine light or fault codes.

A customer complaint regarding the engine light being on led to diagnosing code P1498 related to DPF overloading. Live data monitoring revealed that the diesel particulate filter pressure sensor signal was out of specification due to either a component fault or blockage. Inspections showed no issues with the sensor itself, but high soot levels indicated a blockage in the diesel particulate filter. A vacuum test confirmed this blockage, necessitating further action for resolution.

The customer reported that the check engine light was on in their 2014 Land Rover Freelander. After connecting a scan tool, a P00B8 code was found, indicating a correlation issue with the mass or volume air flow. A subsequent road test revealed a hissing sound, prompting a smoke test that identified a leak from the damaged charge air cooler hose. The hose was replaced, codes cleared, and a successful road test demonstrated proper vehicle operation with no fault codes or warning lights.

Replaced the faulty air suspension compressor on a 2019 Land Rover Range Rover Sport 2.0L Petrol after diagnosing code C1A13. The ABS light was on, and testing confirmed the compressor did not respond. After replacement, codes were cleared, a road test was performed, and the issue was resolved. The ABS light remained off, and no fault codes returned.

A 2015 Audi A1 1.0L GB had a check engine light due to a faulty electronic throttle control motor. Diagnostics confirmed code P1558, indicating an electrical malfunction in the throttle actuator. After verifying voltage and testing the throttle valve, the faulty motor was replaced. A road test confirmed the fix, with no returning fault codes or issues.

A 2021 Opel Vauxhall Movano 2.3L Diesel arrived with a check engine light and code P0400-00, pointing to an EGR valve issue. Diagnostics confirmed the valve wasn’t functioning properly. After verifying wiring and applying direct voltage, the faulty EGR valve was replaced. A road test confirmed the fix—no more check engine light or returning fault codes.

Monitored live data using a scan tool to shed light on the low flow warning. Found the exhaust gas recirculation valve was inoperative. No loose connections or signs of damage were found on the surface, but after removing the valve, it was clear clogged carbon was the true culprit of the Ford Mondeo’s low flow.

A Scan tool revealed code P1206 – Diesel Particulate Filter Efficiency Below Threshold, and after monitoring live data the filter pressure sensor signal revealed erratic parameters. This indicates a potential fault in the sensor or circuitry. Continue reading to discover the multi-meter tests and other procedures used to complete the fix.