Symptom
Multiple Fault Codes
Cars that came in with a list of codes, and which one mattered.
24 cases
Browse by system
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Diagnosing Multiple Faults on a 2015 VW Passat
A breakdown of a complex diagnostic on a 2015 VW Passat with codes P20BD, P047F, P0674, and P3045. Learn what to check first when tracing multiple faults. -
Diagnosing P06DA00, B275013, and B005013 on a Mercedes-Benz GLA
Diagnostic guide for a 2014 Mercedes-Benz GLA (X156) presenting with SRS open circuit codes B275013 and B005013, alongside a silent P06DA00 oil pump fault. -
2014 Porsche Cayenne: Intermittent HV Battery Charging Fault
A step-by-step diagnostic guide for a 2014 Porsche Cayenne Hybrid with 16 fault codes and an intermittent high-voltage battery charging failure. -
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 Unrelated Codes on a 2010 VW Passat
A step-by-step diagnostic breakdown of a 2010 VW Passat 1.4 TSI with codes P10A0, P0568, and P1698, featuring engine clicking and steering column faults. -
Real Diagnostics Are Rarely One Code
Platform data shows that 31 percent of coded diagnostic sessions contain multiple fault codes. Discover how technicians handle complex multi-code jobs. -
Diagnosing a Low-Voltage Cascade on a 2014 Opel Vivaro
A 2014 Opel Vivaro II presented with a battery light and 11 fault codes. See how we diagnose the root cause behind a cascade of electrical communication errors. -
Why Fault Codes Travel in Packs
Fault codes rarely happen in isolation. Discover why analyzing whole DTC code sets reveals the true root cause faster than reading codes one at a time. -
Diagnosing Multiple Tailgate Faults on a 2019 Toyota RAV4 V
Learn how to diagnose a power tailgate failure with codes B2227, B2226, and B2251 on a 2019 Toyota RAV4 V by tracing shared wiring harness faults. -
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. -
Diagnosing Conflicting O2 Sensor Codes on a Maserati Levante
A 2016 Maserati Levante with P2272, P0157, and P2198 codes shows how conflicting rich and lean O2 sensor signals require structured diagnostic testing. -
Diagnosing an Eight-Code Throttle Cascade on a Golf VI
Learn how to diagnose a rough-running 2009 VW Golf VI presenting with EPC light and codes P1568, P1141, P0171, P1564, P1171, P1542, and P1565. -
Diagnosing Multiple LIN Bus and Lighting Faults on a W176 A-Class
A 2014 Mercedes-Benz A-Class presented with LIN bus communication failures, a dead tail lamp, and battery sensor codes. Here is the diagnostic breakdown. -
Decoding a Multi-System Cascade on a 1.8 TSI
A step-by-step breakdown of how a 2009 SKODA Superb II with a 1.8 TSI engine triggers intake manifold, EVAP, and oxygen sensor faults simultaneously. -
Diagnosing a multi-system failure on a Volvo XC70 II
A step-by-step diagnostic breakdown of a 2013 Volvo XC70 II presenting with fuel, air, and exhaust fault codes at the same time. -
Diagnosing six stored codes on a 2016 Ford S-MAX II
See how a cluster of invalid data codes on a 2016 Ford S-MAX II with no active warning lights leads directly to the right front wheel speed sensor. -
Diagnosing Simultaneous Injector Codes on a Kia Sportage
Learn how to diagnose simultaneous P029C00, P02A400, P02A800, and P02A00 codes on a Kia Sportage without unnecessarily replacing all four injectors. -
Diagnosing Shared Circuit Faults on a 2006 Opel Astra H
Learn how to diagnose P0135, P0141C, and P0443 on a 2006 Opel Astra H by tracing shared power circuits rather than replacing multiple parts at once. -
Diagnosing 14 Fault Codes on a 2016 VW Tiguan
A 2016 VW Tiguan presented with 14 fault codes and intermittent ABS, ESP, and tire pressure warnings. See how to trace this back to voltage and gateway issues. -
Diagnosing Dual Rear Sensor Codes on a Volvo V40
A 2012 Volvo V40 presented with codes P170181, C003A07, and C003707. See the step-by-step diagnostic path for shared ABS circuit failures. -
Diagnosing Six Electrical Codes on a 2006 SAAB 9-3
A 2006 SAAB 9-3 presented with mixed circuit codes and no AC, but working fans. See how we traced six different DTCs to a single electrical distribution fault. -
Diagnosing Shifting Fault Codes on a 2014 FIAT 500L
Learn how to diagnose P0808 and P1C9B transmission high signal faults on a 2014 FIAT 500L, focusing on wiring harness and ground connection testing. -
Diagnosing P0131, P14AB, and P0441 on a 2017 VW Golf VII
Explore a real diagnostic case on a 2017 VW Golf VII with P0131, P14AB, and P0441 codes. Learn how an open EVAP valve triggers false lean sensor readings. -
Diagnosing a Cascading Electrical Failure on a 2014 Audi A6
A 2014 Audi A6 enters the shop misfiring with 11 fault codes across the injectors, EGR, AdBlue, and DPF systems. Here is how to sequence the diagnosis.