Vehicle Diagnostics

Codes P0105 through P0109 indicate Manifold Absolute Pressure (MAP) sensor faults. The MAP sensor measures the pressure inside the intake manifold and is used by the ECM to calculate engine load and air mass on speed-density fuelling systems. When the MAP sensor fails, drivability problems are immediate and obvious. What the MAP Sensor Does The […]

Code P0335 indicates a Crankshaft Position Sensor A circuit malfunction. The crankshaft position sensor (CKP) is one of the most critical sensors on a modern engine – the ECM uses it to determine engine speed, crankshaft position, and timing for fuel injection and ignition. When it fails, the engine often will not start or will […]

Holden vehicles dominated Australian roads for decades before the brand was discontinued in 2020. Millions of Holden Commodores, Captivas, Cruzes, Astras, Colorados, and Trailblazers remain in service, and parts and diagnostic support continue from various GM-related sources. This guide covers the most common Holden dashboard warning lights and what they typically indicate. Check Engine Light […]

P0700 is a transmission control module (TCM) generic fault code that means the TCM has detected a fault in the transmission system but is reporting it through the engine ECM. P0700 itself does not tell you what is wrong – it is a flag that other transmission codes are stored in the TCM. To diagnose […]

Fiat vehicles in Australia include the iconic 500 hatchback, the 500X crossover, the Ducato large van (also rebadged as the Ram ProMaster in some markets and used as the base for many motorhomes), the Doblo small van, and the Professional commercial range. They share platforms and powertrains with other Stellantis brands (Alfa Romeo, Jeep, Peugeot, […]

Codes P0101 through P0104 indicate Mass Airflow (MAF) sensor faults. These codes are common on older vehicles and cause noticeable drivability issues: hesitation, stalling, rough idle, and poor fuel economy. Diagnosis is usually straightforward if you understand how MAF sensors work and the order to test things in. What a MAF Sensor Does The Mass […]

Mini vehicles (R50/R52/R53 first-generation BMW Mini, R55/R56/R57 second-generation, F55/F56/F57 third-generation, and the latest F66 generation) are owned by BMW and share many components and electronics with the broader BMW range. They have their own characteristic issues that owners and home mechanics should know about, particularly around the prone-to-fail PSA-co-developed Prince engines (N12, N14, N18) used […]

Codes P0440 through P0457 indicate faults in the Evaporative Emissions Control System – the system that captures fuel vapour from the tank and routes it back through the engine to be burned instead of venting to atmosphere. These codes are frustrating because the fix is often something as simple as a loose fuel cap, but […]

Citroen vehicles share platforms and electronics with Peugeot and DS within the Stellantis group, and include models like the C3, C4, C5 Aircross, Berlingo, and the C5 X. They have their own branding on warning messages but share most underlying technology with their PSA siblings. This guide covers the most common Citroen dashboard warning lights, […]

Peugeot vehicles include the 208, 308, 2008, 3008, 5008, and the Partner and Boxer commercial models. They share many components with Citroen and DS within the Stellantis group, and use similar diagnostic conventions. This guide covers the most common Peugeot dashboard warning lights. Service Light The spanner icon on Peugeot vehicles indicates that scheduled service […]

P0420 (Catalyst System Efficiency Below Threshold, Bank 1) and P0430 (Bank 2) are among the most common check engine codes – and also among the most misdiagnosed. Many vehicles get a perfectly good catalytic converter replaced when the actual fault is much cheaper to fix. Understanding what these codes really mean lets you avoid wasting […]

Renault vehicles include the Megane, Captur, Koleos, Trafic, and Master commercial models. Renault has its own diagnostic conventions and uses a mix of standard OBD-II codes and Renault-specific manufacturer codes. This guide covers the most common Renault dashboard warning lights. Service Light / Spanner Symbol The spanner icon on Renault vehicles indicates that scheduled service […]