Need some help with the following:

I had a check-engine light come on with the following codes, but need help deciphering what the codes are. Anyone have access to this data?

P041
P042

Thanks in advance!

- Rich

 

Check on renntech.org

 

Codes should be 4 digits in length. Unless is is a fault 41 and 42 which have to do with the transponder in the key. IThis indicates that your transponder is not properly being identified by the vehicle. These error will not allow your car to start.

 

Yep - was missing the extra zeros at the end (was going off of memory).

Thanks also for the tip re: Renntech.

P0410 Secondary Air Injection System - Signal Implausible (Cylinders 1 - 3)
P0420 Catalytic Converter Conversion Too Low (Cylinders 1 - 3)

Hmmmm. Doesn't sound good.

- Rich

 

Check the fuse for the secondary air pimp that is located in the relay box behind the back seat. (I think it is in the same place as the 996)

 

0-62
0 DME 7.8 DME 7.8
P0420
40 TWC conversion, bank 1 - above limit
Diagnosis conditions
• TWC temperature 420 - 600 °C
• 85 seconds within rpm/load range (cumulative)
• EVAP canister burden < 8
• Speed 1280 - 2440 rpm
• 20 - 40 % engine load (relative air charge)
• Oxygen sensing ahead of TWC is active
• Oxygen sensing after TWC ready for operation
• Engine starting temperature > - 20 °C
• No faults in memory
Possible fault cause
♦ Oxygen sensor ahead of and after TWC exchanged
♦ Valve lift fault
♦ Aged oxygen sensor after TWC
♦ TWC faulty
Affected terminals
-
Diagnosis/troubleshooting
Note!
If an ageing oxygen sensor is recorded in conjunction with a fault in the TWC, a check must be performed with a
new oxygen sensor to see whether a TWC fault is still indicated.
Work instruction Display OK If not OK
1 Check whether the oxygen
sensors ahead of and
after the TWC have been
exchanged
2673 P0420 0-62 page 1
Printed in Germany, 2000 p0420
0 DME 7.8 DME 7.8
Work instruction Display OK If not OK
2 Perform system test for
small lift
See below
3 Replace TWC
Perform system test for small lift
Warning!

 



  
 
 
During the system test for small lift, the valves remain at small lift,
regardless of the type of driving. Faulty switching conditions can be
detected by rough running, just like with misfire detection. If a valve
is not switched to small lift, the fault type ’under limit’ is recorded.
Several cylinders may be stored as faulty, although only 1 valve on
one cylinder is faulty.
In order to guarantee safety during repairs, the flat-base tappets of
the inlet valves of the entire cylinder bank should be replaced if a
fault occurs.
A faulty flat-base tappet can be detected because the oxygen sensor
FR for this cylinder bank enriches the mixture (FR > 1) during
acceleration with wide-open throttle ⇒ see drawing below. Difference
from the other oxygen sensor > approx. 15 %. In the case of a
fault, the flat-base tappets of the inlet valves for the entire cylinder
bank must be replaced.
2673 P0420 0-62 page 2
p0420 Printed in Germany, 2000
0 DME 7.8 DME 7.8
A
B
A - Oxygen sensor, bank 1
B - Oxygen sensor, bank 2
1 - Select system test.
2 - Select ’Request small lift’.
If "Valve lift diagnosis not ready" appears, a fault may have
been stored.
1. Erase the fault memory.
3 - Activate the system test with the key F8 immediately
before acceleration with wide-open throttle.
The message "Drive link active" then appears.
Note!
DME 7.8 DME 7.8
2673 P0420 0-62 page 4
p0420
0
Printed in Germany, 2000
♦ If a fault is detected, it is only recorded in the fault memory after
6,000 ignitions (at idling speed approx. 3 minutes waiting time).
♦ It is important to observe the oxygen sensor during acceleration
with wide-open throttle or to record its behaviour with the data
logger.
Note!

 

DME 7.8
2665 P0410 0-58 page 1
DME 7.8
p0410
0
Printed in Germany – 1, 2000
0-58 P0410
80 Secondary Air Injection System, Bank 1 – Below
Limit
Diagnosis conditions
• Intake air temperature 4.5 - 60 °C
• Engine temperature 4.5 - 102 °C
• Mass air flow 36 - 150 kg/h
• Engine starting temperature less than 42 °C
• Altitude correction factor greater than 0.75
• Oxygen sensors 1 and 2 ahead of TWC are ready for operation
• The secondary air injection pump is switched on
• Diagnosis has not yet taken place during this cycle
Possible fault cause
♦ Secondary air injection pump is not triggered
♦ Secondary air injection pump does not work
♦ Air supply lines restricted
♦ Electric change-over valve does not function
♦ Air change-over valve does not function
♦ Vacuum system leaking
Affected terminals
III/11 and III/14
Diagnosis/troubleshooting
DME 7.8 DME 7.8
2665 P0410 0-58 page 2
p0410
0
Printed in Germany – 1, 2000
Secondary air diagnosis can be activated with the Porsche System Tester 2 in the "Short test" menu.
Work instruction Display OK If not OK
1 Activate secondary air
pump.
♦ Remove relay of secondary air
injection pump.
♦ Jumper terminals 30 and 87.
♦ The secondary air pump must
be running (audible function).
– or
♦ Connect and switch on Porsche
System Tester 2.
♦ Select DME.
♦ Call up "Drive links" menu.
♦ Select "Secondary air pump".
♦ Activate secondary air pump
(audible function).
⇒ Step 3 ⇒ Step 2
2 Check triggering of secondary
air pump
♦ Check fuse (Maxi Fuse) of AIR
pump (on relay carrier 2).
♦ Remove relay of AIR pump (on
relay carrier 2).
♦ Measure voltage between pin 3
and ground
♦ Push relay back on.
Battery positive voltage
Check wire from pin
2 to DME control
module pin III/11 for
continuity.
♦ Remove connector of AIR pump.
♦ Measure voltage at pin 1 and pin
2
Battery positive voltage
3 Check vacuum system for
leaks
Seal vacuum system
4 Check electric changeover
valve
♦ Remove two-pole connector of
electric change-over valve.
♦ Trigger AIR pump with Porsche
System Tester 2.
♦ Measure voltage at pin 1 and pin
2
Battery positive voltage
♦ Remove vacuum hose of electric
change-over valve with the
engine running.
Vacuum must be
present
Note!
DME 7.8
2665 P0410 0-58 page 3
DME 7.8
p0410
0
Printed in Germany – 1, 2000
5 Check air change-over
valve
♦ Run engine briefly to produce
vacuum.
♦ Activate secondary air pump.
♦ Remove vacuum hose of air
change-over valve.
Vacuum must be
present
♦ After activation, check air
change-over valve for continuity
6 Check air supply lines for
blockage
Work instruction Display OK If not OK
DME 7.8 DME 7.8
2665 P0410 0-58 page 4
p0410
0
Printed in Germany – 1, 2000

 

Cool - thanks, guys.

- Rich