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Low boost after Air Filter Change


TNHSTI

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So last night i changed out my factory air filter for a K&N Panel Filter in my 2007 Legacy GT went for a drive afterwards and shortly into the drive i noticed the boost was cut back to 0.5bar instead of its usual 1.0bar 

 

I checked all hoses etc and everything is ok my only conclusion is the air flow sensor was on the way out and the new filter put oil onto it..

 

I tried cleaning the sensor etc but no luck, car didnt throw any Cel im guessing i need a new sensor? Looks to have never been cleaned or changed since new and car has just done 106,000kms

 

Any ideas? 

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KM’s are pretty low to have already killed the sensor. Plus doubt a filter change would instantly stuff it.

Have you got any logging gear? 

Does it feel sluggish in general or just that it’s low on boost? 

Resetting the ECU to get rid of any currently learnt values is probably a good start

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1 hour ago, Andy_Mac said:

KM’s are pretty low to have already killed the sensor. Plus doubt a filter change would instantly stuff it.

Have you got any logging gear? 

Does it feel sluggish in general or just that it’s low on boost? 

Resetting the ECU to get rid of any currently learnt values is probably a good start

 

Hmm yeah well when I removed the sensor it was filthy, no I havent unfortunately, it's both sluggish and low on boost, hmm ok how do I go about resetting it on an 07 legacy?

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1 hour ago, Pappu1 said:

maybe it was compensating for the clogged sensor and the new refreshed sensor was unexpected

good job for the sort out tho!

 

Yeah could well have been I guess - anyone else had issues with K&N Filters or oiled ones in general?

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