[FOCUS'r'US]

My check-engine light has been on for quite sometime now...

Since it has come on, the car has been getting much worse gas mileage. Every OBD II scan has shown codes related to the O2 sensor.

So far I have...
-replaced the O2 sensor twice with third-party brands
-replaced the O2 sensor with the OEM model
-replaced the pig-tale (connects the sensor to the wiring harness) with the OEM sensor installed.
Unfortunately I didn't provide the exact codes. I should be able to if necessary.

Also, the car tends to have a very unresponsive throttle for a bit when moderately warm.

Please assist me in solving this problem is you can.

 

[FOCUS'r'US]

A bit more info: 2004 SVT Focus
40,000 miles
Stock

 

[focusin]

My check-engine light has been on for quite sometime now...

And this forum has been SVT performance chat/owners lounge for even longer, please post threads like these in technical chat.


Moved.

 

[Grumpy]

A scantool/code scanner can be your best friend......scan for codes as your next troubleshooting step and before throwing any more parts on this car.

 

[northof60]

Check the fuse in the engine bay that is for heated O2 sensors. Could be that.

 

[FOCUS'r'US]

I scanned before purchasing each part.
______

Thanks, I'll check the fuse.

I feel like the chain auto-shop that I went to first, tampered with the car...