New here: Camshaft (P0491 and P0492) and SAI (P1325 & P1341) error codes on both banks at once?

[911Savant]

New here with my newly purchased 2002 Carrera 6 speed with 136,000 miles on it. One owner, and car was dealer maintained since new. Has LN IMS bearing installed. Check engine light came on a few days after purchase.

I attached an image of the codes pulled up on my Durametric.

 

I can hear the SAI pump whine when I first start the engine. It stumbles a bit when first started.  Once warm it runs great and has good power through the rev range, however there's a very slight hesitation somewhere around 4,000rpm...maybe at the point where the Variocam actuators are supposed to work? Also the idle moves around a little bit (800-1100rp1) when first coming off from revving it, then settles in around 900.

 

I measured the vacuum at the oil cap and it is 4.5 in. of water at idle which is within spec.  I inspected the SAI vacuum lines, and there don't appear to be any cracks.

Does anyone know if or how the SAI and Camshaft errors are related?  They show up at the same time...and on both banks!  If I clear the codes they all come back within a few days of driving.  What should I test next?  

 

Edited August 16, 2022 by 911Savant

[JFP in PA]

Welcome to RennTech 

 

With a mix of codes this odd, I would clear them all and see what comes back, if anything.

[911Savant]

Thanks for the welcome!
 

I’ve cleared them a few times, and they always come back the same.  The clutch position sensor is bad on mine…that’s a separate issue I need to fix.

Edited August 17, 2022 by 911Savant

[JFP in PA]

OK, then let's look at the rest:

 

P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow

Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted

   

 

P1325 Camshaft Adjustment, Bank 2 – Signal Implausible

P1341 Camshaft Adjustment, Bank 1 - Signal Implausible

Possible cause of fault
Camshaft does not reach early or late position
♦ Dirt in system

♦ Solenoid hydraulic valve mechanically blocked

♦ Wiring fault