Can You Use An Upstream O2 Sensor Downstream?

Are upstream and downstream o2 sensors the same part?

Master ASE Mechanic and FAA Certified Aircraft Mechanic see less Most older O2 (oxygen) sensors were narrow band.

The upstream is NARROW BAND and downstream is WIDE BAND.

Upstream is before the Cat and downstream is after the cat.

The catalytic converter is where you will find the sensors..

How do I know if my upstream or downstream oxygen sensor is bad?

The downstream or diagnostic sensors only monitor the exhaust leaving the catalytic converter and will not cause such an issue. Other symptoms of a bad oxygen sensor include a rough idle, a misfire, and/ or hesitation when trying to accelerate.

Should I replace upstream or downstream o2 sensor?

A mechanic said we need to replace our downstream oxygen sensor and that we should also replace the upstream one too since they usually go at the same time. … The downstream o2 sensor measures catalytic converter efficiency. The upstream sensor is used to deliver the proper amount of fuel to that bank of cylinders.

Can bad spark plugs cause o2 sensor code?

Bad Spark Plug, Wire, or Fuel Injector Because the oxygen in that cylinder isn’t burned up, the extra oxygen in that cylinder winds up passing over the O2 sensor. … The danger is that the extra fuel injected to compensate eventually winds up being burned in the catalytic converter.

Does downstream oxygen sensor affect gas mileage?

Do downstream o2 sensors affect gas mileage? If the downstream O2 sensor tends to stay below center all the time, the PCM will adjust the goal voltage higher in an efforet to correct the low O2 readings of the downstream sensor. This can result in low fuel mileage.

Which oxygen sensor is most likely to fail?

The upstream oxygen sensor is located before the catalytic converter. It measures the level of oxygen in the exhaust manifold and sends this info to the ECU. That way, the engine knows how to adjust the air/fuel mixture. The upstream O2 sensor is more prone to failure than the downstream sensor.

What should a downstream o2 sensor read?

When the engine is first started, the downstream O2 sensor’s output will mirror that of the upstream O2 sensor, and flip-flop back and forth between rich and lean. Once the converter lights off, the downstream O2 sensor will settle down and “flat-line” at a steady voltage reading usually around 0.45 volts or so.

Which o2 sensor goes bad first upstream or downstream?

bank 1 sensor 2 is usually the first to go. just replaced one on a 98. the part is 99 bucks, I paid someone 40 for the install. But yes, you should replace both the upstream O2 sensors at the same time.

Can you bypass oxygen sensors?

How to Bypass Oxygen Sensors. Bypassing an oxygen sensor–also called an O2 sensor–can only be done using a dummy O2 sensor. Oxygen sensors are part of the vehicle’s emissions control system and it may or may not be legal to replace the O2 sensor with a dummy sensor.

Do o2 sensors need downstream?

The amount of oxygen sensors a vehicle has varies. Every car made after 1996 is required to have an oxygen sensor upstream and downstream of each catalytic converter.

What is downstream oxygen sensor?

The downstream oxygen sensor is located directly after the catalytic converter. This sensor measures the pollutants making it through the converter and out of the tailpipe. The data from this sensor is compared to that of the upstream sensor.

Is bank 1 sensor 2 upstream or downstream?

It is the sensor that measures the oxygen content in the exhaust, providing an input to the computer, which determines how to adjust the air/fuel ratio. Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor. It is always going to be located after the catalytic converter.

What are the symptoms of a bad downstream o2 sensor?

Symptoms of a Bad or Failing Oxygen SensorCheck Engine Light comes on. The first line of defense is the Check Engine Light. … Bad gas mileage. If the oxygen sensor is going bad, the fuel-delivery and fuel-combustion systems will be thrown off. … Rough engine idle and misfires.

Does downstream o2 sensor affect performance?

A “downstream” O2 sensor is placed either in or just behind the converter to monitor oxygen levels after the exhaust has reacted with the catalyst. … A bad O2 sensor should not affect engine starting, cause a misfire (unless the spark plugs become carbon fouled), or cause engine stalling or hesitation problems.