Dtc P0135, P0141, P0155, Or P0161 - Suzuki XL7 2007 Service Manual

8. Verify that none of the following conditions exist:
– The HO2S is loose
– Lean or rich fuel injectors—Refer to "Fuel Injector
Balance Test with Special Tool: " or "Fuel Injector
Balance Test with Tech 2: ".
– Water intrusion in the HO2S harness connector
– Low or high fuel system pressure—Refer to "Fuel
System Diagnosis: ".
– Fuel that is contaminated—Refer to "Alcohol/
Contaminants-in-Fuel Diagnosis (w/o Special
Tool): " "Alcohol/Contaminants-in-Fuel Diagnosis
(w/ Special Tool): ".
– Fuel saturation of the evaporative emission
(EVAP) canister
– Exhaust leaks near the HO2S

DTC P0135, P0141, P0155, or P0161

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC P0135: HO2S Heater Performance Bank 1 Sensor 1
DTC P0141: HO2S Heater Performance Bank 1 Sensor 2
DTC P0155: HO2S Heater Performance Bank 2 Sensor 1
DTC P0161: HO2S Heater Performance Bank 2 Sensor 2
Diagnostic Fault Information
Circuit
Ignition Voltage Supply - Primary HO2S
Ignition Voltage Supply - Secondary HO2S
HO2S Bank 1 Sensor 1 Heater Control
HO2S Bank 1 Sensor 2 Heater Control
HO2S Bank 2 Sensor 1 Heater Control
HO2S Bank 2 Sensor 2 Heater Control
Engine General Information and Diagnosis:
– Engine vacuum leaks
➢ If you find any of the above conditions, repair as
necessary.
9. If all circuits/connections test normal, replace the
applicable HO2S.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Heated Oxygen Sensor Replacement - Bank 1
Sensor 1: "
• "Heated Oxygen Sensor Replacement - Bank 2
Sensor 1: "
• "Control Module References: " for engine control
module replacement, setup, and programming
Short to Open/High
Ground Resistance
P0010, P0013,
P0023, P0030,
P0031, P0050,
P0030, P0031,
P0051, P0134,
P0050, P0051
P0135, P0154,
P0155, P0458,
P2088
P0036, P0037,
P0056, P0057,
P0036, P0037,
P0140, P0160,
P0056, P0057
P0645, P0646,
P0691, P0693
P0031 P0030, P0134
P0037 P0036, P0140
P0051 P0050, P0154
P0057 P0056, P0160
Signal
Short to Voltage
Performance
—
—
P0032 P0135
P0038 P0141
P0052 P0155
P0058 P0161
1A-92
—
—