Discovery II
ENGINE MANAGEMENT SYSTEM - V8
18-2-32 DESCRIPTION AND OPERATION
Should a malfunction of the component occur the following fault codes may be evident and can be retrieved by
TestBook:
P Code
J2012 Description
Land Rover Description
P1129
O
2
sensors swapped bank to bank (sensor 1)
Front sensors transposed
P0130
O
2
sensor circuit malfunction (bank 1, sensor 1) Front sensor LH bank stoichiometric ratio outside
operating band
P0132
O
2
sensor circuit high voltage (bank 1, sensor 1) Front sensor LH bank short circuit to battery supply
P0134
O
2
sensor circuit no activity detected (bank 1,
sensor 1)
Front sensor LH bank open circuit
P0150
O
2
sensor circuit malfunction (bank 2, sensor 1) Front sensor RH bank stoichiometric ratio outside
operating band
P0152
O
2
sensor circuit high voltage (bank 2, sensor 1) Front sensor RH bank short circuit to battery supply
P0154
O
2
sensor circuit no activity detected (bank 2,
sensor 1)
Front sensor RH bank open circuit
P0136
O
2
sensor circuit malfunction (bank 1, sensor 2) Rear sensor LH bank stoichiometric ratio outside
operating band (NAS only)
P0137
O
2
sensor circuit low voltage (bank 1, sensor 2)
Rear sensor LH bank short circuit to earth (NAS only)
P0138
O
2
sensor circuit high voltage (bank 1, sensor 2) Rear sensor LH bank short circuit to battery supply
(NAS only)
P0140
O
2
sensor circuit no activity detected (bank 1,
sensor 2)
Rear sensor LH bank open circuit (NAS only)
P0156
O
2
sensor circuit malfunction (bank 2, sensor 2) Rear sensor RH bank stoichiometric ratio outside
operating band (NAS only)
P0157
O
2
sensor circuit low voltage (bank 2, sensor 2)
Rear sensor RH bank short circuit to earth (NAS only)
P0158
O
2
sensor circuit high voltage (bank 2, sensor 2) Rear sensor RH bank short circuit to battery voltage
(NAS only)
P0160
O
2
sensor circuit no activity detected (bank 2,
sensor 2)
Rear sensor RH bank open circuit (NAS only)
P0133
O
2
sensor circuit slow response (bank 1, sensor
1)
Front sensor aged - period time too long/too short LH
bank
P0153
O
2
sensor circuit slow response (bank 2, sensor
1)
Front sensor aged - period time too long/too short RH
bank
P1170
Downstream fuel trim malfunction (bank 1)
Front sensor aged - rear HO
2
S adaption too lean/too
rich LH bank (NAS and EU-3 only)
P1173
Downstream fuel trim malfunction (bank 2)
Front sensor aged - rear HO
2
S adaption too lean/too
rich RH bank (NAS and EU-3 only)
P0135
O
2
sensor heater circuit malfunction (bank 1,
sensor 1)
Front sensor heater LH bank - short/open circuit
P0141
O
2
sensor heater circuit malfunction (bank 1,
sensor 2)
Rear sensor heater LH bank - short/open circuit (NAS
and EU-3 only)
P0155
O
2
sensor heater circuit malfunction (bank 2,
sensor 1)
Front sensor heater RH bank - short/open circuit
P0161
O
2
sensor heater circuit malfunction (bank 2,
sensor 2)
Rear sensor heater RH bank - short/open circuit (NAS
and EU-3 only)
P0420
-
Catalyst efficiency deteriorated - LH bank (NAS and
EU-3 only)
P0430
-
Catalyst efficiency deteriorated - RH bank (NAS and
EU-3 only)
