Technical library
DTC codes
Meaning, checks and real cases, published only with a verified technical basis.
04
DTC codes
P0340
P0340 Code: Meaning, Causes and Camshaft Sensor Diagnosis
P0340 does not by itself prove the sensor has failed. A guide to checking connections, the circuit, signal and timing before replacing parts blindly.
→P042FP042F: EGR stuck closed, causes and Ford diagnosis
Understand P042F, compare commanded and actual EGR position and check the circuit before replacement. Includes a real Ford Transit repair.
→P1303Ford P1303: EGR calibration fault and diagnosis
Ford P1303 explained: EGR calibration, checks before a relearn and what to investigate if the code returns after fitting a new valve.
→P1335Ford P1335: EGR position stops and diagnosis
Ford P1335 and EGR position references: understand the stops, check the feedback circuit and see how the code relates to P1303 and P042F.
→