P0133

Description
HO2S 1 CIRCUIT SLOW RESPONSE

PCM provides about 0.45 volt reference to HO2S 1. HO2S 1
sensor signal voltage varies from about one volt when exhaust is rich
to about 0.1 volt when exhaust is lean. PCM counts number of times a
rich-to-lean and lean-to-rich response is indicated and adds amount of
time it takes to complete all transitions. PCM uses this information
to determine average time for each transition. If average response
time is slow, DTC P0133 will set.
Symptoms
You will likely not notice any drivability problems.

Causes

• The oxygen sensor is faulty
• The wiring to the sensor is damaged
• Exhaust leak

Possible Solutions

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back.

• Check and fix any exhaust leaks
• Check for wiring problems, repair.
• Check the frequency and amplitude of the oxygen sensor need a scan tool
• Replace O2 sensor
• Check for inlet air leaks (vacuum leaks)
• Check the MAF sensor to make sure it'* working correctly.