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P0161 and P0141 O2 Sensor Codes on Land Rover Discovery - Diagnosis and Fixes

Model: Land Rover Discovery Fault Code: P0141 Posted: 2012-01-10 14:04

I recently encountered two diagnostic trouble codes: P0161 and P0141 on my Land Rover Discovery. I replaced both oxygen sensors located in the post-catalyst position, as recommended by the error code guidance. After resetting the check engine light, it reappeared after just 20 miles of driving. I've thoroughly inspected all wiring harnesses and fuses under the hood related to the O2 sensors. The issue persists despite these efforts. My question is: does the vehicle need to go through several drive cycles after replacing the oxygen sensors before the codes clear? If so, how many cycles are typically required? Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0141P0161
Comments (2)
Anonymous 2012-01-11 07:21

Did you source the replacement O2 sensors from an authorized dealer or an aftermarket brand? The quality and compatibility can significantly impact performance and code resolution.

Anonymous 2012-01-15 14:45

I installed Bosch part number 15630 with pre-attached connectors. During installation, I discovered a short in one wire. After fixing the wiring, the system went blank for 75 miles before the P0161 and P0-than codes returned. I replaced the O2 sensor again—this time at no cost—and the issue remains: P0141 persists. A detailed wiring diagram showing which signal feed corresponds to each bank would be very helpful. Based on my observations, it appears that the right bank's sensor is feeding into the left side, leading me to suspect a wire rub or damage near the transmission area. At this point, I believe the issue is not with the O2 sensors themselves but rather with wiring or signal interference. Any additional suggestions or diagnostic tips would be appreciated.