Sensor Checks
- Check Heated Oxygen Sensor (HO2S) 1 performance. See DIAGNOSTIC AIDS for DTC P0130: HO2S 1 CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article.
- Inspect the Mass Air Flow (MAF) sensor operation. Run engine to normal operating temperature. Turn OFF all accessories and observe the MAF sensor at idle using a scan tool. If MAF sensor reading is more than 3.5 g/s, see DTC P0101: MAF SENSOR PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 1.8L VIBE article.
- Check for correct operation of the Engine Coolant Temperature (ECT) sensor. A fixed or inaccurate ECT sensor reading can cause the engine to surge, especially at low speeds and at stops.