我遇到了1998年马里布的问题。我一直得到几个代码，但主要是P0420。我已经两次更换催化转换器。两个氧传感器都已更换。我检查了质量空气流量和EGR，它们似乎都运行正常。有人能提出解决这个问题的想法吗？以下是Carista和Torque的输出。
谢谢
Carista ：
OBD2 - confirmed:
P0102 - Mass or Volume Air Flow "A" Circuit Low
P0122 - Throttle/Pedal Position Sensor/Switch "A" Circuit Low
P0401 - Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0420 - Catalyst System Efficiency Below Threshold Bank 1
OBD2 - pending:
P0401 - Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0420 - Catalyst System Efficiency Below Threshold Bank 1
P1441
扭矩：
Fault log report generated by Torque for Android
=================================================
Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: Not present
Current Fault Log
------------------
P0102: Mass or Volume Air Flow Circuit Low Input
P0122: Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P0401: Exhaust Gas Recirculation Flow Insufficient Detected
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
Pending Fault Log
------------------
P1441: [BMW] Leakage Diagnostic Pump Control Open Circuit
[Chrysler] Evaporative Emission (EVAP) System Flow During Non-Purge
[Nissan] Vacuum Cut Valve Bypass Valve
[Dodge] Evaporative Emission (EVAP) System Flow During Non-Purge
[Jeep] Evaporative Emission (EVAP) System Flow During Non-Purge
[Seat/Audi/Volkswagen] EGR Valve Circ Open/Short to Ground
扭力 ：
Mode $06 report generated by Torque for Android
================================================
Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: Not present
Unit and scaling information are not supplied with the data from the ECU for this type
of vehicle. Consulting the manufacturers service book for this information is recommended.
Test report:
------------------
TID:$02 CID:$04
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$10
- Lean to Rich sensor threshold voltage(constant)
Min: 79
Test result value: 79
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Min: 250
Test result value: 171
FAIL
----
TID:$02 CID:$20
- Lean to Rich sensor threshold voltage(constant)
Max: 250
Test result value: 15
PASS
----
TID:$02 CID:$26
- Lean to Rich sensor threshold voltage(constant)
Max: 100
Test result value: 8
PASS
----
TID:$02 CID:$30
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$31
- Lean to Rich sensor threshold voltage(constant)
Max: 110
Test result value: 138
FAIL
----
TID:$02 CID:$40
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$46
- Lean to Rich sensor threshold voltage(constant)
Min: 65
Test result value: 65
PASS
----
TID:$06 CID:$35
- Lean to Rich sensor switch time(calculated)
Max: 111
Test result value: 47
PASS
----
TID:$06 CID:$41
- Lean to Rich sensor switch time(calculated)
Max: 342
Test result value: 49
PASS
----
TID:$07 CID:$0c
- Minimum sensor Voltage for test cycle(calculated)
Max: 0
Test result value: 65,491
FAIL
----
TID:$07 CID:$0d
- Minimum sensor Voltage for test cycle(calculated)
Max: 1
Test result value: 2
FAIL
----
TID:$0c CID:$20
- Misfire counts for last/current driving cycles(calculated)
Max: 0
Test result value: 33,536
FAIL
----
TID:$02 CID:$04
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$10
- Lean to Rich sensor threshold voltage(constant)
Min: 79
Test result value: 79
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Min: 250
Test result value: 171
FAIL
----
TID:$02 CID:$20
- Lean to Rich sensor threshold voltage(constant)
Max: 250
Test result value: 15
PASS
----
TID:$02 CID:$26
- Lean to Rich sensor threshold voltage(constant)
Max: 100
Test result value: 8
PASS
----
TID:$02 CID:$30
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$31
- Lean to Rich sensor threshold voltage(constant)
Max: 110
Test result value: 138
FAIL
----
TID:$02 CID:$40
- Lean to Rich sensor threshold voltage(constant)
Test incomplete or dependant test failed
--
TID:$02 CID:$46
- Lean to Rich sensor threshold voltage(constant)
Min: 65
Test result value: 65
PASS
----
TID:$06 CID:$35
- Lean to Rich sensor switch time(calculated)
Max: 111
Test result value: 47
PASS
----
TID:$06 CID:$41
- Lean to Rich sensor switch time(calculated)
Max: 342
Test result value: 49
PASS
----
TID:$07 CID:$0c
- Minimum sensor Voltage for test cycle(calculated)
Max: 0
Test result value: 65,491
FAIL
----
TID:$07 CID:$0d
- Minimum sensor Voltage for test cycle(calculated)
Max: 1
Test result value: 2
FAIL
----
TID:$0c CID:$20
- Misfire counts for last/current driving cycles(calculated)
Max: 0
Test result value: 33,536
FAIL
----
End of report.