RAV-4 2005 2.0 Diesel code P1251

[Ross8081]

Having a repeating problem of car going into limp mode.

Taken car to mechanic on several occasions

work done to fix problem so far has been

1, replace turbocharger vacuum regulating valve.

2,  service /recondition turbo

3, replace faulty sub catalytic converter assembly.

After all this work to fix the problem and some large bills

car is still occasionally going into limp mode with same error code P1251

Does anybody have any suggestions what to do next?

[igormus]

23 hours ago, Ross8081 said:

Having a repeating problem of car going into limp mode.

Taken car to mechanic on several occasions

work done to fix problem so far has been

1, replace turbocharger vacuum regulating valve.

2,  service /recondition turbo

3, replace faulty sub catalytic converter assembly.

After all this work to fix the problem and some large bills

car is still occasionally going into limp mode with same error code P1251

Does anybody have any suggestions what to do next?

hello

this means overboost after turbocharger. Check if all vanes are easy rotated around pins + vacuum impulse tube to be clean.

the problem is pass between vanes. in details - when you rev engine the turbocharged picks up your desire but the vanes remain in the same position at all RPM of turbocharger. but it must be changed automatically (using an impulse vacuum tube and mechanism). be sure vanes are smoothly rotated; impuls is free of obstackles.

cheers \ Igor