Downstream O2 Sensor Voltage High

Downstream O2 Sensor Voltage High. Does this mean i have a bad catalytic converter, or is there another explanation? It could be the o2 sensor, since 0.9 and 1.0 are both high, and indicating a rich mixture.

2344098 Upstream/Downstream Oxygen Sensor 02 O2 for 1994
2344098 Upstream/Downstream Oxygen Sensor 02 O2 for 1994 from www.ebay.com

If the (o2) sensor only produces a. If the signal from the downstream o2 sensor continues to mirror that from the upstream oxygen sensor(s), it means converter efficiency has dropped off and the converter isn't cleaning up the pollutants in the. Diagnostic trouble code (dtc) p0158 stands for o2 sensor circuit high voltage (bank 2, sensor 2).

I Understand That If The Upstream O2 Sensor Voltage Is High Or Low, It Could Possibly Mean That The O2 Sensor Itself Is Good And The Combustion Got A Problem.


This can result in low fuel mileage. Diagnostic trouble code (dtc) p0158 stands for o2 sensor circuit high voltage (bank 2, sensor 2). Therefore, the downstream oxygen sensor (sensor 2) should produce a steady voltage of approximately 0.45 volts.

Manufacturers Use Many Different Voltages To An O2 Sensor.


The voltage will drop a bit at idle and raise a little when running but should always be stable and not varying like the front sensor. An oxygen sensor reads oxygen levels only; What would cause downstream o2 sensor voltage to be low, other than o2 sensor itself is bad?

The O2 Sensor 2 Is The Downstream O2 Sensor And It Measures The Amount Of Oxygen In The Exhaust Gases Leaving The Catalytic Converter (Cat).


And since you didnt mention any fluctuation in voltage, i believe it is a faulty circuit, maybe it is the regulator and. It should never mirror the operation of the front sensor if the catalyst is properly storing oxygen. The downstream sensor should read a more steady voltage, usually somewhere above 0.450v on the rich side but if its not setting a code id not worry about it.

If The Reading Is Outside The Specified Range, The Sensor Is Defective.


The car's ecu is quick to pick up such a problem and it will promptly indicate you through the check engine light. Manufacturers constantly strive to build their vehicles to meet tougher emission standards each year. It should stay above 0.550v at the least but usually ~80% of the highest pre cat o2 reading, when cruising down the highway.

If It Does, Then The Catalytic Converter Is Bad And Needs To Be Replaced.


0.10 volts indicates high oxygen levels, whereas 0.90 volts indicates low oxygen levels. Obd code p0158 is set when the o2 sensor 2 has been emitting a voltage signal above its normal range for a certain amount of. The escape is seems like it is running great but now both downstream 02's are reading extremely rich under idle and extremely lean under load.

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