P0340 Camshaft Position Sensor Circuit: Checks That Save Money
What the ECU is missing when it sets a cam sensor circuit code, how it differs from a crank sensor fault, and the checks worth doing before ordering a part.
AutoScan journal
Fault codes explained properly, what each one usually costs to put right, and how to check it yourself before anyone quotes you.
What the ECU is missing when it sets a cam sensor circuit code, how it differs from a crank sensor fault, and the checks worth doing before ordering a part.
What a crank sensor circuit fault really covers, why the classic version only shows up once the engine is hot, and how to test it without buying parts.
P0016 is a mechanical timing fault far more often than a sensor fault. Here is what the ECU compared, what usually causes the mismatch, and what the repair costs.
Why a lean code on bank 2 alone points somewhere completely different from one on both banks, how to compare the two sides in live data, and what the fixes cost.
Variable valve timing runs on engine oil, so this code often comes down to oil condition rather than a worn phaser. Here is how to check it and what each repair costs.
The exact limits, methods and defect categories the tester works to on petrol and diesel cars, taken from the DVSA inspection manual and explained in plain English.
A heater fault on the rear lambda sensor rarely changes how the car drives, but it blocks the readiness monitor. Here is how to test it and what the repair costs.
Modern cars report dozens of live parameters and most of them will not help you. The handful that actually diagnose faults, and how to read them together.
Why the EGR system exists, how the ECU works out that too little exhaust gas is getting through, and when cleaning the valve is worth doing instead of replacing it.
The dates that decide whether a car supports OBD2 diagnostics at all, what generic OBD2 can and cannot reach, and how to check your own vehicle in two minutes.