An oxygen sensor slow response or low activity trouble code is almost always a faulty oxygen sensor. There are a few other things to consider before replacing the oxygen sensor. Exhaust leaks upstream or very near the oxygen sensor as well as oxygen sensor heater circuit malfunctions can also set this code.
Engine Performance Diagnostics chapter 5
Symptoms
- check engine light (P0134)
- poor gas mileage
- rough idle
- runs fine intermittently
Fix
- replace faulty oxygen sensor
Tests shown
- scan data O2 analysis
Tools used
- scan tool
Engine Performance Diagnostics chapter 5
Symptoms
- check engine light (P0134)
- poor gas mileage
- rough idle
- runs fine intermittently
Fix
- replace faulty oxygen sensor
Tests shown
- scan data O2 analysis
Tools used
- scan tool
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