i get about 16/21 (city/highway)mpg.....i recently changed out all my plugs....filters and even the KS....i use premium gas at all times and im only gettin 16 miles per gallon with mostly city driving.....

i have scanned my ecu and it doesnt pull up any o2 sensor codes.....i was wondering if there is any other way to test the o2's to see if they r bad?

i have no idea what could be causing the horrible gas mileage...i dont want to spend a fortune on o2 sensors if they are still good.....i have 100k miles and i dont think the o2's have been changed b4.....

what do u guys recommend me doin?

 

The haynes maual has procedures for testing the sensors.

 

Mzmtg, a small question. OBDII scan indicated bad front O2 sensor on Bank 1 Sensor 1. Does this mean that I need to replace both the O2 sensors on the front or just one ? thanks.

I do get abt 18 mpg on only city driving and two weeks ago I got 24.98 mpg on only highway driving.

 

http://www.autozone.com/servlet/UiBr...3d801f4e84.jsp

Sensor

The ECM contains an oxygen sensor monitor function which is used to test the oxygen sensor.

Locate the ECM and take note of the LED and mode switch positions.

Turn the ignition switch ON.

Turn the mode switch screw fully clockwise.

Wait at least 2 seconds.

Turn the mode switch screw fully counterclockwise.

Start the engine and allow it to reach operating temperature.

Run the engine at approximately 2000 rpm for 2 minutes under no load.

Ensure that the red LED on the ECM or the Malfunction Indicator Lamp (MIL) on the dashboard flash on and off more than 5 times every 10 seconds.

If the red LED on the ECM or the MIL do not function as specified, check the oxygen sensor circuit back to the ECM for continuity.

If continuity exists, the oxygen sensor may be faulty.

 

I think if your car is hesitating from a cold start then it is time to change the front sensors. I just changed mine after battling a rich condition for a while. Changed plugs, air filter. My gas mileage was never below 25mpg.
Seems that the sensors need to warm up to give you the best mpg. If you are driving mostly city, then your mileage sucks. With the price of gas, sensors pay for themselves rather quickly.

 

WTF is all that ****?

Our ECUs don't have any LEDs on them...