well i seem to have two sensors both before the cat.

 

are you sure?
what year ? what engine ?

typical non-california setup is 2 sensors. one after the Y-pipe and just in front of the cat, and one just after.

california setup was 4 sensors. one in each side before the dual cats, and one after each of the dual cats.

 

0132/0208/0300/0302/0304.

http://www.obd-codes.com/p0132

bank 1/sensor 1 is front O2 on a 2 sensor system.
front drivers side on a 4 sensor system.
usual problem is the shorted out heater circuit. normal wear out failure.


http://www.obd-codes.com/p0208


ignore the 300's. they are misfire reactions to the others.

 

well it looks as if someone has been creative in home welding thier extra loud exhaust both of my 02 sensors are in front of the cat. thank you dhvaughan for the help. am now heading to advance auto to pick up the front sensor/plus look at thier exhaust pipe (i have a 110 fluxcore mig and a hacksaw, this will be fixed) thanks alot guys for all the help/ I will post back and let you all know how it goes.

 

what year is your truck ???? 94-95 (OBD-1) or 96+ (OBD-2)


you probably already know this, but the front O2 of a 2 sensor system is for measuring the exhaust and tuning the fuel mix. this one's very important to prevent overly rich or overly lean running. its typically after the junction of the Y-pipe, so its monitoring the combined exhaust from both sides of the engine. a 2 sensor OBD-2 cannot monitor left side and right side of the engine independently.

the second sensor is after the cat. its only purpose is to check that the emissions after the cat are lower than those before the cat. the computer does not use this sensor for tuning the mix. its only for monitoring the cat.

 

it is a 2000 1500 slt , well cut the exhaust moved the cat up, they had reused it but it was located about the tailshaft. changed the 02 sensor (at the y pipe).well started it up it is still missing and giving the same codes. unhooked the batt for about 20 mins. hooked back no codes but still missing like crazy wont idle no power. pulled the front plug driver side of motor looks bad black nasty smells like oil more than gas cleaned and regapped it (gap was about 38 going to look for proper gap after posting this)fired it back up not missing as bad but now wont idle at all.

 

you can speed up the reset of the pcm by disconnecting neg battery cable and turning on headlights for 30 seconds. it drains the memory and clears the codes.

with pcm reset, the engine should run with or without any O2's. those are not used for input until closed loop mode, which is at normal temp after about 5 minutes.

you have more problems than just O2 arrangement. so its back to square one. check for obvious vac leaks, check plugs, check spark, wires, dist cap. fuel/fuel pressure.

 

pulled plugs and cleaned gap 40 still no check eng light will try to run for 5 or 10 mins till warm up hopefully a new code will pop up/ will pull dist cap and check rotor button next. plug wires look good all up and away from exhaust

 

dist cap looked terrible burnt contacts green corrision replaced dist. cap rotor button/ still no love (scratching head).

 

well now it is throwing a p0201 code/P0201 Injector #1 Ctrl Circ/ any ideas for a fix