DTC P1134: O2S1 Transition Time Ratio: Description

Oxygen sensor responds to oxygen content in exhaust manifold. Sensor voltage is read by the PCM to determine a rich/lean O2S1 signal used to adjust injector pulse width. Normal sensor reading will fluctuate between 10-999 millivolts. DTC sets when O2S1 signal rich to lean and lean to rich average response time is too long or too low.