@manuelniebla here are the possible causes for the P0131 code:
Front H02S malfunction Connector or terminal malfunction
Open circuit in wiring harness between front H02S terminal A and PCM terminal 2AD
Short to ground in wiring harness between front H02S terminal A and PCM terminal 2AD
Open circuit in wiring harness between front H02S terminal B and PCM terminal 2Z
Short to ground in wiring harness between front H02S terminal Band PCM terminal 2Z
PCM malfunction
Use this part of the workshop manual [document|41541] to do a deep dive and to diagnose which part may actually cause this error. Most commonly issue are bad Oxygen sensors. Here is the location of the sensors
[image|3597732]
[image|3597731]
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