2885 Boost Deviation Plausibility Error

BMW and Mini Cooper 2885 Boost Pressure Control Deviation Plausibility Error 

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Here are some items that we have found that cause this error. please feel free to contact us if you have any questions or want to add to this list.

Turbo Exhaust housing Failure, .

Over time the Wastegate on a turbo can wear and start leaking air around the valve. This will cause the turbo to spool late and in most cases cause a low boost or out of range error. Check that the valve is not warn or loose enough to cock to the side when closed. They wear out quickly because the waste gate is on a duty-cycle meaning rapidly opening and closing or changing position when in boost. We typically see failure starting at about 80k miles or sooner.

Blow Off Valve Failure

Remove the BOV and test it by applying 12dc and ground to the two leads. The piston should move in when 12dc power is applied. Also remove it and check the diaphragm is not ripped or torn and leaking. If the catalytic converter is clogged you will see liquid oil in the BOV and the oil can cause functionality issue with the BOV.

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Electronic or Vacuum Waste Gate Failure

for electronic wastegates, if you get an error that the actuator is not moving check to see if the linkage is damaged or warn. If it is not replace the electronic actuator.

For vacuum operated Wastegates, use a vacuum pump connected to the waste gate actuator vacuum canister to test for leaks, it should fully close the waste gate when vacuum is turn on and fully open it at atmosphere. If you don’t have a vacuum pump it can also be tested by blocking the vacuum port and closing the valve to see if pressure builds and closing the waste gate and blocking the vacuum port then releasing the waste gate to see if the vacuum canister sucks in air. If it fails in either direction it will need to be replaced.  

Vacuum Line Failure

Checking all vacuum lines for damage, wear, holes, soft collapsible tubing due to oil damage or restricted. (check vacuum pump also)

Turbo Failure

If the turbocharger is not making boost and the turbines have contacted the housing the turbocharger should be replaced. If not when the turbine hits the housing it will shed aluminum flakes into the intake system and metal flakes into the engines intake system. This type of failure is usually due to the catalytic converter getting clogged over time or low oil flow due to a clog in the oil supply line.

Inter-cooler/after turbocharger Leak

Inter-cooler and post turbocharger leaks can cause your turbocharger to fail due to it over spinning to reach boost pressure. The leak will not allow the turbochargers to reach boost pressure and it can cause the compressor to grenade throwing aluminum chunks into your engine. Always fix any intake leaks immediately.

Clogged air filter

A clogged air filter can cause your turbocharger to fail due to it over spinning to reach boost pressure. The clogged air filter will not allow the turbochargers to reach boost pressure and it can cause the compressor to grenade throwing aluminum chunks into your engine. Always replace your air cleaner as recommended by the OEM manufacture.

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