P38A Abs and Tc fault

Hello. RR p38 2,5 year 2000
Abs and TC lamp, and some times handbrake light is on. Code reader says: inlet valve open circuit rear right and rear left. Changed both sensors... any sugestions? I checked the resistance on sensors. Both sensors on front axel has around 945ohm both rear axel has around 1100ohm.

First step, check the battery voltage.

Datatek said:

First step, check the battery voltage.

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That should be ok

Next step check brake fluid

Next step check brake fluid level

AC800 said:

That should be ok

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Guessing is not good enough on the P38, low battery voltage causes many spurious faults.

Agreed 90% chance its the battery.

The Handbrake light illuminated doubles up as a fluid level warning light, check the level.
Also worth noting the Accumulator sphere often fail and the Nitrogen charge disappears and it loses pressure, you'll note the fluid level at minimum or below if this is the case as the fluid takes up the space where the nitrogen used to be in the sphere.

Check for leaks though around the system first OBVS.

The wheel speed sensors are another, check them and the associated reluctor rings.

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

Accumulator or ABS pump? Brake fluid should be above max and drop to max on start up. Low brake fluid will cause problems I believe. May need bleeding, if so follow Rave to the letter

Accumulator or ABS pump? Brake fluid should be above max and drop to max on start up. Low brake fluid will cause problems I believe. May need bleeding, if so follow Rave to the letter

Too much cucumber for tea, repeating myself

Also check the brake peddle switch is set correctly as per Rave

AC800 said:

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

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That doesn't sound good. Pollen filters might be leaking or possibly the windscreen trim.

AC800 said:

Fluid level is Max. No leaks. Is it possible the fault can be the ABS ECU? Opened it up and looks like it had some water in it...

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The late type 4 wheel TC ECU's do fail and if it's wet it's probably toast.

Rubberknees said:

Accumulator or ABS pump? Brake fluid should be above max and drop to max on start up. Low brake fluid will cause problems I believe. May need bleeding, if so follow Rave to the letter

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Correct. Switch on and run engine only top up to MAX when ABS pump has stopped running. After standing a while level should be well above max and drop to max when pump has stopped.