← Back to list

2001 Eclipse GT Check Engine Codes P0141, P0136, P0403, P0443, P1400 - Causes and Solutions

Model: 2001 Eclipse GT Fault Code: P0136 Posted: 2014-02-28 19:28

I own a 2001 Mitsubishi Eclipse GT and have recently noticed a significant drop in engine performance. The vehicle feels like it's producing more power than normal, but this is actually a sign of underlying issues. I'm also experiencing rapid fuel consumption, which is concerning. My OBD-II scanner has picked up the following diagnostic trouble codes: - P0141: Heated Oxygen Sensor Bank 1 Sensor 2 fault - P0136: Heated Oxygen Sensor Bank 1 failure - P0403: Exhaust Gas Recirculation (EGR) flow error - P0443: Evaporative Emission Control System Leak - P1400: Manifold Differential Pressure Sensor Circuit malfunction I've heard that a single faulty sensor can trigger multiple related codes. Is this true in my case? If so, which component is most likely at fault? Should I replace all sensors and systems listed, or is there a more targeted approach to diagnosing the root cause? What steps should I take next to resolve these issues safely and effectively? Any advice would be greatly appreciated.

Related fault codes
P0136P0141P0403P1400
Comments (6)
Anonymous 2014-03-01 09:41

These codes do not necessarily require component replacement — they indicate system-level faults. Start by inspecting the heater circuit of the oxygen sensors, including wiring integrity and fuses. Also check for EGR valve blockage or improper operation. A faulty mass airflow (MAP) sensor could contribute to multiple issues.

Anonymous 2014-03-02 02:12

I've noticed that when idling, my oil light turns on intermittently, and the engine overheats regularly — though it only reaches about 3/4 of its normal temperature. This may point to a thermostat issue or poor cooling system performance.

Anonymous 2014-03-02 10:52

The combination of check engine lights, oil light activation, and recurring overheating strongly suggests the need for professional diagnosis. These symptoms could indicate serious mechanical or sensor-related problems that require expert evaluation before further action.

Anonymous 2014-04-30 15:04

I drive a 2001 Mitsubishi Montero Sport and have been experiencing intermittent engine light activation. My recent emission inspection passed all tests except for the MIL (Malfunction Indicator Lamp) — CMD (Commanded) failed. I'm not sure what this means, but it seems related to system monitoring.

Anonymous 2014-04-30 15:20

Trying to interpret the acronyms: 'MIL' refers to the Malfunction Indicator Lamp, and 'CMD' stands for Commanded — likely indicating that the system failed to activate a required signal. A simple test is to check if the check engine light comes on within two seconds of starting; if not, it may point to a bulb failure or wiring issue. This should be confirmed by an inspector.

Anonymous 2014-05-05 19:19

maemae wrote: I drive a 2001 Mitsubishi Montero Sport and have been seeing my engine light go on intermittently, had an emission inspection today — everything passed except the MIL; CMD = Fail. Why?