System
Emissions & exhaust
DPF, EGR, AdBlue and SCR, NOx, catalysts and lambda sensors: the codes behind most warning lights on modern diesels.
69 real cases
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Diagnosing P0421 and P0401 After an Engine Swap on a 2016 Outlander
A 2016 Mitsubishi Outlander presented with a rough hot idle and codes P0421 and P0401 after an engine swap. We trace the faults to reused overheated parts. -
Diagnosing P24D600 and P24D800 on a 2019 Porsche Panamera
A detailed look at diagnosing EVAP fault codes P24D600 and P24D800 on a 2019 Porsche Panamera 3.0L V6, covering the G950 sensor, wiring, and N80 valve. -
Diagnosing P2209 and P220A on the Vauxhall Insignia
Learn how to diagnose P2209 and P220A fault codes on a 2016 Vauxhall Insignia 2.0 CDTi, covering NOx sensor failures, TSB 16-E-3243, and circuit tests. -
Diagnosing Stacked Intake and Exhaust Codes on a 2018 Audi A6
A 2018 Audi A6 presented with P010100, P20EE00, P203F00, and P229F00 but no driveability issues. See the diagnostic breakdown. -
Diagnosing a Solitary P2097 Code on a 2015 Cadillac ATS
A solitary P2097 code on a 2015 Cadillac ATS points to a rich condition. Learn why leaking direct injectors and EVAP faults cause this before replacing sensors. -
Diagnosing a P0456 Very Small EVAP Leak on a SAAB 9-3X
A real diagnostic path for a P0456 very small EVAP leak on a 2010 SAAB 9-3X, covering fuel cap seals, purge valves, and vent solenoids on the B207R. -
Diagnosing P200300 on a 2015 Hyundai i40
Explore a real diagnostic case of a P200300 DPF efficiency code on a 2015 Hyundai i40, covering sensor failures, clogs, and exhaust leaks. -
Diagnosing a P0401 on a 2019 Audi Q2
A breakdown of the top causes for a P0401 insufficient EGR flow code on a 2019 Audi Q2, from carbon buildup to MAF sensor faults. -
Diagnosing a 340km no-start on a 2014 Mercedes W447
See how to diagnose a six-code emissions fault and a 340km no-start countdown on a 2014 Mercedes V-Class by isolating the NOx sensor. -
Diagnosing P246B and Power Loss on a 2013 Ford Kuga
A concrete diagnostic guide for a 2013 Ford Kuga with a P246B fault code and intermittent power loss, detailing exhaust fuel vaporiser and thermostat checks. -
Diagnosing P0102 and Unexpected EVAP Symptoms on a MINI Clubman
A 2009 MINI Clubman presented with a P0102 MAF code alongside fuel EVAP symptoms. We explore the diagnostic path from wiring faults to stuck purge valves. -
Diagnosing P20EE00 on a VW Tiguan 2.0 TDI
A step-by-step diagnostic path for resolving a P20EE00 SCR efficiency code on a Volkswagen Tiguan 2.0 TDI, covering the N474 valve and G687 sensor drift. -
P2413 on a Mitsubishi L200 After an EGR Replacement
A technician replaced the EGR valve on a 2006 Mitsubishi L200, but the P2413 code remained. We break down the real causes, from cheap parts to soot blocks. -
Diagnosing P0440 and an Extended Crank on a 2015 Grand Cherokee
Explore a real diagnostic case on a 2015 Jeep Grand Cherokee with a P0440 EVAP code and a 5-second extended crank. See the top ranked root causes and tests. -
Diagnosing P2BA700 and P24C600 on a Volvo V60
A technical breakdown of diagnosing overlapping emissions faults, including P2BA700, P24C600, and P24C768 on a Volvo V60 SPA platform. -
Diagnosing Code P242F on a 2014 Opel Vivaro
A 2014 Opel Vivaro presented with fault code P242F for DPF restriction. We break down the four most likely causes, from ash accumulation to sensor drift. -
Diagnosing P2196 on a 2015 KIA Sorento III
A detailed look at diagnosing a P2196 stuck rich fault code on a 2015 KIA Sorento III when the engine appears to be running normally. -
Land Rover Discovery IV AdBlue Countdown Diagnosis
A 2011 Land Rover Discovery IV with P2BAE, P2BAF, P2BA9, and U0241. Step-by-step diagnostic breakdown of the SCR fault causing a no-start countdown. -
Diagnosing P2002 and P1468 on a 2013 Subaru Outback III
Discover how oil dilution and failed regeneration trigger codes P2002 and P1468 on a 2013 Subaru Outback III, and the exact steps to diagnose the true cause. -
Diagnosing a P3005F1 Code on a 2022 Iveco Daily VI
See how to diagnose a P3005F1 fault code on a 2022 Iveco Daily VI by examining cold-start diagnostic routines and electrical heating circuits. -
Diagnosing P0101, P0410, and P228F on a 2013 C-Class
A structured diagnostic path for a 2013 Mercedes-Benz C-Class presenting with rough idle, high-speed hesitation, and codes P0101, P0410, and P228F. -
Diagnosing Ghost Code P0020E on a 2019 Peugeot 5008
Learn how to bypass scan tool artifacts like P0020E on a 2019 Peugeot 5008 and properly diagnose the real P20EE SCR efficiency fault on a 1.5 BlueHDi engine. -
Diagnosing a P013E and Low Boost on a 2011 SAAB 9-5
When a 2011 SAAB 9-5 shows a P013E code and low boost, the oxygen sensor is likely just the messenger. Learn how to diagnose the real root cause. -
Diagnosing Cascading Faults on a 2020 BMW 3 Series
A technical look at diagnosing ten fault codes across the VANOS system, DPF, and FlexRay network on a 2020 BMW 3 Series without wasting bay hours.