This started as an intermittent issue, and was resolved with a brake light switch and or wheels speed sensor, it had a run of 6 months before it’s returned. It’s immediately on during start up and this time it doesn’t go away

code is P0503

list of items I’ve replaced:
3x - front left wheel speed sensor
3x - brake light switch
1x - MAF sensors both sides
1x - Air filter
1x - Battery

Durametric is reading signal/revolutions from all 4 corners

Any recommendations on what to do next? I took it to the dealer and paid $300 for them to tell me it’s the wheel speed sensor 🤦‍♂️ . I’m dreading the cost of a shop to diagnose….

Hoping someone here has further knowledge, Tnx for reading

 

Are all wheel speed sensors moving/logging at the same time? Is there any spike when you log it in durametric? They should all be moving at the same rate and there should not be any spikes, if there are spikes, check which wheel speed sensor is not reading correctly,