Code 1 means an oxygen sensor but it doesn't say front or back here is the way to check it if you are mechanically inclined. You may need aharness adapter to do this though
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CODES 1 & 2 O2 SENSOR
1. Turn ignition off and reset ECU. Remove alternator sense fuse in under hood relay box for 10 seconds to reset ECU. Sta
pressure. See FUEL INJECTION article. Repair fuel system if not within specification. If fuel pressure is within specifi
2. Bring engine to operating temperature (cooling fan on). Hold engine speed at 1500 RPM for 15 minutes, without closing
this time. Check if "CHECK ENGINE" light is on and if LED is indicating Code 1 or Code 2. If not on, problem is interm
3. If light is on, disconnect indicated oxygen sensor connector. Attach voltmeter to vehicle ground and connector. With eng
temperature, momentarily open throttle wide open, then close throttle.
4. Voltage at wide open throttle should be greater than .6 volt, and less than .4 volt at full closed throttle. If not within sp
sensor. If voltage is within specification, proceed to next step.
5. Turn engine off and attach system checker harness between ECU and ECU connector. Using a voltmeter, connect negative terminal A18
6. For front oxygen sensor, attach positive voltmeter lead to connector terminal C12 and C10 for rear oxygen sensor. See
7. Start engine and warm to operating temperature. Momentarily open throttle wide open, then close throttle. Voltage at wi
greater than .6 volt and less than .4 volt at full closed throttle. If not within specification, repair wire between ECU and
specification, substitute a known good ECU. If condition is rectified, replace original ECU.
Saturday, March 9th, 2013 AT 8:04 PM