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If the upstream sensor fails (forward of cat) the engine will run either rich or lean and have rough idle poor fuel economy and possibly set a failure code (but not always) If the downstream sensor fails it could possibly set a catalyst failure code when the sensor itself has failed in actuality instead of the converter. Bottom line is codes are guide lines and starting points for diagnostic TESTING if you want to spend a lot of time and money then go ahead and replace parts based on failure codes. Anytime you have o2 sensor code failures run a diagnostic scan and watch real time data stream and watch the activity of the sensor (all of them) you want to see fast changes (rich ..lean ) or voltage values depending on how your scan tool reads and displays info. slow reading / changing sensors are borderline failures and should be replaced. no activity is also a failure.
What else can I help you with?
Is there a health risk when your oxygen sensor fails?
Yeah, you can't beath.
What happens when the throttle position sensor fails?
engine will proberly only idle
What happens when a speed sensor goes out on a 1995 Dodge Intrepid?
If a transmission speed sensor fails, the transmission will default to second gear.
Rav4 oxygen sensor replaced and immediately the idle valve fails is there a link?
No, there is no link between the two.
What happens when the c o detector fails in a gas dryer?
When the Carbon monoxide (CO) detector fails in a gas dryer, the alarm sensor malfunctions.
What happens to a 1998 Pontiac sunfire when the oxygen sensor needs to be replaced?
It depends on which o2 sensor.
What happens to a 1999 Honda Accord when the oxygen sensor goes bad?
When the oxygen sensor goes bad, the check engine light goes on.
What happens in subaru with faulty oxygen sensor?
When a Subaru has a faulty O2 sensor the fuel management is out of whack.
What happens when the crank shaft sensor fails?
The ignition timing will be off causing misfiring among other problems.
What happens when a oxygen sensor goes bad?
When an oxygen sensor goes bad a car will burn gas at a higher than normal rate because it will not be producing as much power as before. The oxygen sensor checks the amount of exhaust.
What happens when to oxygen sensor does not work anymore?
The vehicles don't run right
Where are the oxgen sensors on the 1999 Saturn SC1?
The oxygen sensor that typically fails is attached to the exhaust manifold, just above the headpipe. It looks a little like a sparkplug, and has an electrical connection. The OTHER oxygen sensor is behind the catalytic converter.
