95 240SX: Trouble codes P0130 (Front O2 Sensor) & P0325 (Knock Sensor Circuit)

[italia16]

A year ago, I had the front O2 sensor replaced and the Check Engine Light came on a couple weeks ago so it was replaced again by the dealer. The light came back on a week later with the codes P0130 and P0325. I don't know what the codes were in the previous cases.

I don't notice any performance changes. Any ideas on what to do now? Is is worth cleaning the fuel injectors. Other than running rich and getting bad gas mileage, does it need to be fixed?

Thanks,Mark

[albert_ey]

OK I got these of Mitchell on-demand

P0130- Closed Loop ControlIf Closed loop control is interrupted, probable cause is in front oxygen sensor.

Diagnostic Procedure- 1. Check input Signal CircuitTurn Ignition off. Disconnect ECM Harness connector and knock sensor sub-harness connector. Check Harness continuity between knock sensor sub-harness connector terminal "b"(White Wire) and ECM connector terminal No. 54. If Continuity is present go to next step. If not repair harness.

2. Check ComponentDisconnect knock sensor wiring harness connector. Check for continuity between sensor terminal No. 2 (White Wire) and ground. If continuity is not present, replace knock sensor. If continuity is present, disconnect ECM wiring harness connector. Check ECM pin terminals for damage or corosion.

I hope this helps in some way. I don't know if you have a multi meter but you need one to perform these tests.