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Discussion Starter · #1 ·
Hello everyone,

I've been getting some very peculiar readings from the O2 sensors of my 2003 307 1.6 16v (see chart below).
This was taken on a trip during November 2021 and a P0420 message had come up once which I erased and hasn't come up since with everyday urban driving.

I'd appreciate any help on the subject.

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Hi, did this trigger the engine light? The post cat sensor started to switch with the front sensor, usually if the rear sensor follows the front it would indicate a failing catalyst.
 

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Discussion Starter · #3 ·
Hi, did this trigger the engine light? The post cat sensor started to switch with the front sensor, usually if the rear sensor follows the front it would indicate a failing catalyst.
This was after the warning light, just before I erased the code.
After erasing the code, I drove back from the trip (around 500km) and since then I've been driving daily in the city without a check engine light coming on.
 
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