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P0130 P0141 P0135 P0146 Error Codes on 2001 Mercedes-Benz CLK430 - O2 Sensor Diagnosis

Model: UNKNOWN Fault Code: P0135 Posted: 2015-09-01 16:35

Hello everyone, I'm new to this forum and have a question about my wife's 2001 Mercedes-Benz CLK430. The car is showing multiple O2 sensor fault codes: P0130, P0141, P0135, and P0146. I recently replaced the front oxygen sensor (Bank 1 Sensor 1) with a new, correct unit — I didn't want to replace both if only one was faulty. After clearing the codes and taking the car for a drive, the fault codes returned, and now both the front and rear O2 sensors are flagged. I'm wondering what could be causing this issue. Is it possible that the problem lies elsewhere in the system — such as wiring, connectors, or the engine control module? Any advice on how to diagnose these persistent P0130/P0141/P0135/P0146 codes would be greatly appreciated.

Related fault codes
P0130P0135P0141P0146
Comments (4)
Anonymous 2015-09-03 06:44

Check all wiring, connectors, and harnesses for the oxygen sensors. Look for loose connections, chafed wires, or physical damage — these are common causes of recurring P0130 and P0141 codes.

Anonymous 2015-10-22 19:36

Hi everyone, I'm also dealing with a 2001 Mercedes-Benz CLK430 with a 4.3L engine and persistent P0130 code. I replaced the Bank 1 oxygen sensor (front O2 sensor), but the error code is still showing up. I've inspected all vacuum hoses and wiring, and everything appears fine. Any suggestions? I'm particularly curious about whether I replaced the correct sensor or if there's a deeper issue with the system.

Anonymous 2015-11-01 19:50

This isn't a Land Rover — it's a Mercedes-Benz CLK430, so please ensure your advice is specific to this model and engine configuration.

Anonymous 2015-11-11 17:56

Georgearnold wrote: Hi everyone, I'm also dealing with a 2001 Mercedes-Benz CLK430 with a 4.3L engine and persistent P0130 code. I replaced the Bank 1 oxygen sensor (front O2 sensor), but the error code is still showing up. I've inspected all vacuum hoses and wiring, and everything appears fine. Any suggestions? I'm particularly curious about whether I replaced the correct sensor or if there's a deeper issue with the system. Please confirm which sensor you replaced — front or rear Bank 1? Also check fuses under the hood in the front fuse box (N10/1), specifically fuse #43. There is also a relay (KL) in that same box — try swapping it to test for continuity. Before doing any of this, connect an O2 sensor scanner capable of reading lambda data (also known as oxygen sensor readings). Compare the live signal from each sensor with others. If one shows weak or inconsistent signals, focus on checking fuse #43 and the relay. This is a common issue in 4.3L Mercedes engines. Good luck!