Engine Code and Terrible Gas Mileage

[Wicked_Sludge]

a battery is a voltage generator.

an O2 sensor takes a reference voltage of 5 volts (supply by the pcm, not created at the sensor) and drops it to a lower voltage before sending it back to the pcm. the amount of drop depends on the amount of oxygen flowing past the sensor.

 

[shadetree]

Explain 1 wire 02 sensors! The sensors are generators. shady

Edit - More from Wiki:
The probe
The sensor element is a ceramic cylinder plated inside and out with porous platinum electrodes; the whole assembly is protected by a metal gauze. It operates by measuring the difference in oxygen between the exhaust gas and the external air, and generates a voltage or changes its resistance depending on the difference between the two. The sensors only work effectively when heated to approximately 300°C, so most newer lambda probes have heating elements encased in the ceramic to bring the ceramic tip up to temperature quickly when the exhaust is cold. The probe typically has four wires attached to it: two for the lambda output, and two for the heater power, although some automakers use a common ground for the sensor element and heaters, resulting in three wires. Earlier non-electrically-heater sensors had one or two wires.

 

[Dave R]

a battery is a voltage generator.

No, that's a storage device. A battery will run out of current eventually, an O2 sensor will generate voltage, as long as there is an oxygen differential, for YEARS.

But, instead of debating with those significantly less informed...

"The oxygen sensor is positioned in the exhaust pipe and can detect rich and lean mixtures. The mechanism in most sensors involves a chemical reaction that generates a voltage (see the patents below for details). The engine's computer looks at the voltage to determine if the mixture is rich or lean, and adjusts the amount of fuel entering the engine accordingly. "

Taken from THIS webpage. Underlining added by yours truely.


Have you any relatives by the name of levi?

Explain 1 wire 02 sensors!

I'm sure he thinks that they are run by magic.

 

[Wicked_Sludge]

I'm sure he thinks that they are run by magic.

dont be a dick, dave.

i was under the impression that O2's created resistance for a reference voltage, like many other sensors on an engine. little did i know it was a chemical reaction creating its own voltage.

and if you guys are quite done digressing...the point remains that assuming a sensor is bad rather than verifying it one way or the other is not the proper way to diagnose anything.

 

[Dave R]

Sure, right after you stop posting misinformation about crap you don't understand. ASSuming that all sensors on an engine work on the same principle is, well, lmited thinking.

Though I will give you credit for finally learning to admit when your wrong.

 

[Bob Ayers]

a battery is a voltage generator.

an O2 sensor takes a reference voltage of 5 volts (supply by the pcm, not created at the sensor) and drops it to a lower voltage before sending it back to the pcm. the amount of drop depends on the amount of oxygen flowing past the sensor.

Not true, an O2 sensor does not use a 5V reference like the DPFE, or TPS sensors do. The sensor generates a voltage (just like Dave said), and the voltage depends on the air-fuel ratio (usually 200mV for lean, 800mV for rich.
A perfectly balanced or "stoichiometric" fuel mixture of 14.7 parts of air to 1 part of fuel gives an average reading of around 0.45 Volts.


An O2 sensor needs to be hot to work properly, and they usually have an electric heater to help them get to operating temp quicker (open loop to closed loop).

 

[Brih]

fuel bank 1 too lean

I've had the same problem with my 99 2.5 ranger. code 171 fuel bank too lean. From what I have read the problem is the mass airflow sensor. I haven't had the funds to replace mine yet.

My timing belt just broke and I am trying to get top dead center.....but I'm not sure if i'm on tdc for the exaust stroke or the fuel stroke. Any help would be nice.

Good luck and let me know if that helps.
Thanks Brih

 

[JOSHNAUGUSTA]

Any Luck

Hey Fin Fan did you have any luck with your lean problem? I have the same problem with my truck. Let me know what you found please.