I have a 2001 Hyundai Accent, Petrol, 1.5 glx.My mech says the O2 sensor has conked off, but he's unable to get a spare, and everything costs upwards of 5k. I was wondering if there are any cheaper alternatives to fix this.

I think your problem may be MICE. Check your upper and lower O2 Sensor wires. I believe they are both 4 wire sensors. If a wire has been chewed through this is what happens. I personally had this problem myself once in my 2000 Hyundai Accent. GOOD LUCK.

you have more than 1 o2 sensor are you replaceing the one that is bad plus once replaced you have to drive for awhile for computer to reset itself

Only a dealer can make and program a chipped key.To program it yourself requires a machine which probably costs at least $2,000-$3,000 and access to the codes which would not be available to the public/consumers for any reason.Greg

For $29.99 I will tell you. bite me

IAT SENSOR IS MOUNTED INSIDE INTAKE AIR HOSE TO THE AIR CLEANER ASSEMBLY. THE MASS AIR FLOW SENSOR IS ALSO MOUNTED TO THE INTAKE AIR HOSE OF THE AIR CLEANER ASSEMBLY. O2 SENSORS LOCATION.YOU HAVE 2 # O2 SENSORS.YOU HAVE ONE THE EXHAUST MANIFOLD.THE OTHER SENSOR LOCATED DOWN AT THE CATALYTIC CONVERTER.

This may sound stupid but have you checked your fuel cap? I have had a fuel cap cause that misfire code before. Either way its a cheap test. Good luck

P2096 - Post Catalyst Fuel Trim System Low Limit.

Possible Causes
EXHAUST LEAK
ENGINE MECHANICAL PROBLEM
1/2 O2 SENSOR
(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT
(K299) O2 1/2 HEATER CONTROL CIRCUIT
(K904) O2 DOWNSTREAM RETURN CIRCUIT
FUEL CONTAMINATION

the only way to get your compression back where it should be is changing the rings...and while you're at it; fully service the engine

dealer only to programme it,but they can be cut and programmed by a specialist in automotive keys but you will need the 4 figure code for your chassis number and a lot of dealers will not give you this information.Also you cannot remove the factory immobiliser as the ECU unit is extremely complicated and no wiring diagrams are published,Dont argue or go their as iam not happy with the way bill gates look alike nerds are putting me out of work.

I think this is the O2 sensor - It will run fine but you might notice your gas mileage slipping and will not pass emissions.