How may I get the following solved inpathfinder 2005? P1148 closed Loop-B1 P1168 closed loop-B2 P0550 pw St p SEN/CIRC P0037 H02S2 HTR B1 P0057 H02S2 HTR B2 P1031 A/F SEN1 HTR B1 P1051 A/F SEN1 HTR B2

Clean out you idle air bypass valve with carb cleaner. P0031 air/fuel sensor 1 heater (B1)bank 1, p0603 engine control back up circuit,p1148 closed loop B1. Broken heater in upper O2 sensor is one if not all of your problems. Replace all of your O2 sensors & reset engine light.

P1168 is : Closed Loop Control (bank2)

Definition of Diagnostic Trouble Code P1148 Audi: Oxygen Control (Bank 2) System too rich Ford: Closed Loop Control Malfunction Infiniti: Closed Loop (Bank 1) Land Rover: Lambda trim post-catalyst bank 1.Short circuit to ground Lincoln: Closed Loop Control Malfunction Mazda: Generator 2 Control Circuit Mercedes: IAT Sensor Circuit Malfunction, Bank 2 Mercury: Closed Loop Control Malfunction Nissan: Closed Loop Volkswagen: Oxygen Control (Bank 2) System too rich

loosen and re tighten the top left (rear) o2 sensor and check the connector is not loose...

P1148 closed loop control,, this means the computer does not see closed loop , the problem could be a bad air fuel sensor also called oxygen sensor this is the top one before the converter, check the wiring to sensor and connection if that is good then replace the sensor, this sensor on this nissan is called an air /fuel sensor and are costly. good day

CODE P1122 ELECTRONIC THROTTLE CONTROL ACTUATOR. CODE PO102 - MASS AIR FLOW SENSOR VOLUME AIR FLOW VAF SENSOR LOW INPUT. CODE P1031 - HEATED OXYGEN SENSOR HO2S 1 HEATER CIRCUIT MALFUNCTION. CODE P1051 -

P1148 - Closed Loop Control Function Bank 1
This mean that the closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.

The Powertrain Control Module (PCM) or Electronic Control Module(ECM) monitor the function of the Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor by comparing the signal with the Rear O2 sensor.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
- Harness or connectors Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor 1 circuit is open or shorted.
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 heater

Possible solution:
- Repair harness or connector. If repair is needed
- Replaced Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1


Then, possible causes are faulty harness or connectors to the air fuel ratio sensor, a faulty air fuel ratio sensor (1) or faulty air fuel ratio sensor (1) heater. Most likely yes it is just faulty sensor. Just replace this devices and reset the stored codes.

Keep us updated.

P0151 Front O2 Sensor, Bank 2 Lean Shift Monitoring,P1168 Closed Loop, Bank 2 i would do the o2 sensor on this side..and thats it unless you get something else

there is a emission system recall for these codes for your year and model contact the Nissan dealer, it is a no charge repair.
here is the summary of that recall

MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0300-P0306, P1273 OR P1283. *TT *SC
Make : NISSAN Model : QUEST Year : 2004
Manufacturer : NISSAN NORTH AMERICA, INC.
Service Bulletin Number : 04028A Date of Bulletin : MAR 24, 2004
NHTSA Item Number : 10005976
Component : ELECTRICAL SYSTEM
Summary :
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P1031, P1051, P1148, P1168 (A/F SENSOR HEATER / CLOSED LOOP) ON 5 SPEED AUTOMATIC TRANSMISSIONS ONLY. (THIS VERSION SUPERSEDES NTB04-028.) *TT

Have you cleared the codes at least once?
The new o2 sensors should have removed all those codes.The sensor closest to the engine b1s1 may be defective.Check wiring and plug to that one closely.