2002 Civic EX
#1
2002 Civic EX
Have 02 civic ex 1.7 (D17a2) with P0420 . Upstream and downstream sensors are new. Sensor heaters ohm out at 8.6Ohms, downstream sensor passes power test but fails ground test. Upstream sensor fluctuates aprox every second, downstream fluctuates aprox 2-3 seconds and reads below 0.5volts which is not correct.
Ran new ground to chasis plug for down stream and now reads 12.38 (battery volts) but still reads under 0.5volts and fluctuates too much.
Ran new ground to chasis plug for down stream and now reads 12.38 (battery volts) but still reads under 0.5volts and fluctuates too much.
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