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3515

OBD and secondary air system

Pierburg | Motorservice

Malfunctions and faults within the secondary air system can be identified using an on-board diagnostic system (OBD). The diagnostic trouble codes P0410, P0411, P0412, P0415, P0413, P0416, P0414, P0417, P0418 and P0419 indicate faults in the secondary air system. You can find out which components are affected by the different diagnostic trouble codes and how you can check them here.

3515
PIERBURG PRODUCTS ON-BOARD DIAGNOSTICS
01 Secondary air valve (electrical) 06 Engine control unit
02 Secondary air pump (SLP) 07 Malfunction indicator lamp (MIL)
03 Lambda sensor 08 Diagnostic plug
04 Secondary air valve (pneumatic) 09 OBD data scan tool
05 Switchover valve (EUV)

FROM PRACTICAL USE

3516
Simple inspection of secondary air valve
3518
Condensate in secondary air pump
3517
Secondary air pump – corroded electrical connections
3519
Pneumatic secondary air valve: Damage caused by condensate

FINDING AND REMEDYING FAULTS

DIAGNOSTIC TROUBLE CODE P0410 P0411 P0412, P0415
DISPLAYED FAULTS Secondary air system – malfunction
No detection of secondary air by
lambda sensor (no lean signal)
Secondary air system – insufficient
quantity

The secondary air rate detected is too
low (insufficient lean signal)
Secondary air on-off valve A (EUV 1) /
B (EUV 2) electrical fault

The switchover valve (EUV) does not
activate
NEXT STEPS/
POSSIBLE REMEDIES
• Secondary air pump may be
defective. Check SLP, relays, lines
and plug-in connections
• If there is condensate in SLP:
Check the secondary air valve for
tightness and the switchover valve
for functioning
• Check the non-return valve –
replace if soiled
• If there is water in SLP: Check the
vacuum line and valves for tightness
• Check the function of the switchable
non-return valve with vacuum hand
pump
• Check the switchover valve and the
vacuum line
• Check the non-return valve and
secondary air lines for free flow
• Check lines, plug-in connections
and electric switchover valve
DIAGNOSTIC TROUBLE CODE P0413, P0416 P0414, P0417 P0418, P0419
DISPLAYED FAULTS Secondary air on-off valve A (EUV 1) /
B (EUV 2) interruption

The switchover valve (EUV) does not
activate
Secondary air on-off valve A (EUV 1) /
B (EUV 2) short circuit

The switchover valve (EUV) does not
activate
Secondary air system relay circuit A /
circuit B malfunction

Secondary air pump relay A or B does
not activate
NEXT STEPS/
POSSIBLE REMEDIES
• Check lines, plug-in connections
and electric switchover valve
• Actuation of switchover valve
(EUV) not OK
• Check lines, plug-in connections
and electric switchover valve
• Check relays, lines, plug-in
connections and secondary air
pump

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