P0016 phase synchronization (exhaust)/ revs - Alfa Romeo Forum
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P0016 phase synchronization (exhaust)/ revs

Hi every1,

Recently (since month or two) I had this issue that there was a lack of power in my 159 2.2 its. Once you could have felt as it`s properly accelerating but sometimes it was like you have 50 hp less. FES did not show any errors.

I know sty similar can happen when the timing chain is to be changed but mine was changed like 20-30kkm ago.

Yesterday when starting engine in the morning I`ve got "have engine checked" light on. FES showed "P0016 phase synchronization (exhaust)/ revs". I don`t feel any difference in engine work however.

What can that be?

Last edited by Lucasino; 09-12-11 at 07:12.
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In the parameters section of FES, tick both the Exhaust Phase Variator Desired Value and Exhaust Phase Variator Actual Value boxes. The software will now display the value the ECU expects to see and the actual value determined by the sensor on the exhaust camshaft. It might also be helpful to view the parameters as a graph.

The likely reason for the code is that the values don't match (i.e. the cam isn't where it should be relative to the crank) - either at some load/rpm point or across all load/rpm combinations. There will always be small differences and the actual value will lag slightly behind the desired as the hydraulics catch-up. What we're looking for is a difference of several degrees in steady-state operation.

Diagnosing what's actually wrong mightn't be simple as there are a number of possibilites that could cause the problem. E.g. basic cam timing (pulley a tooth out) failed phaser unit, failed control valve for phaser unit or failed cam sensor. Each of these would show up differently in FES and all but the basic cam timing could also be intermittent.

Some pointers:

1) Cam sensor failure - no data in actual value or unfeasible values
2) Basic cam timing - difference between desired/actual values when the phaser can't move the cam far enough to compensate for the pulley being misaligned. Also possible constant difference between desired/actual values
3) Faulty phaser/ control valve - variable differences between desired/actual.

Not sure if the control valve would throw a separate code if faulty - would depend if it's a hydraulic or electrical issue.


Ian from Manchester, UK
(Certifiable Car Nut)!

Current Alfa: 159 Sportwagon 2.2 JTS
Previous Alfas: 156 2.5, 164 3.0, 75 3.0
Other Current Cars: Porsche 997S Gen-2 PDK, BMW Z4 sDrive 23i

Last edited by Ian_UK1; 09-12-11 at 12:16.
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exhaust or , p0016 , phase , revs , synchronisation , synchronization

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