What is OBD II P0133 code, how is it generated and how to fix it?

OBD-II code P0133 is a "Slow Response from the Oxygen Sensor Circuit" code. It is generated when the Engine Control Module (ECM) detects that the voltage or response time from the front oxygen sensor, also known as the upstream oxygen sensor, is slower than expected. The following are some of the common causes for P0133 code: A failing or failed oxygen sensor Wiring issues such as damaged or corroded wiring or connections in the oxygen sensor circuit A clogged air filter that restricts air flow to the engine A vacuum leak that affects air/fuel mixture A damaged or failed catalytic converter To fix this code, the following steps should be taken: Replace the failing or failed oxygen sensor. Check and repair any damaged or corroded wiring or connections in the oxygen sensor circuit. Replace a clogged air filter. Locate and repair any vacuum leaks. Check the catalytic converter and replace if necessary. Inspect and clean the fuel injectors, or replace if necessary.