janowsky

i've been having some weird problems with my jeep lately. its a 2000 grand cheroke laredo 4.7l v8. idling issues, hesitating when accelerating, lots of weird stuff. replaced my TPS with no luck, took it to a dealership to get it diagnosed...they say i need new upstream/downstream oxygen sensors and connectors, new crankshaft position sensor, and new camshaft position sensor. my question is, when i buy the oxygen sensors do they come with the 'connectors' that i supposedly have to replace?

SeriousOffroad

First off.....
NEVER ask a dealership to diagnose your rig.

Do you hcurrently have a Check Engine Light (CEL) on?
If yes, have you plugged in a scanner and retreived the codes?
What are they?

Any auto parts can and will do it for free.

janowsky

i've been searching for a cure to my problems for too long so i just gave in and let the dealership check it out...everyone else just said to replace my TPS and that did nothing. i dont have a check engine light on, and i asked the dealer about it they said because the connectors on my O2 sensors are burnt out they wouldnt send an error and apparently the cam/crankshaft sensors wouldnt send one either? although im sure if they were faulty id have a light...im at the point where if theres a possibility of fixing it just by spending like 250 on some sensors, im okay with that.

here's a link to a thread i posted over at jeepforums that has a detailed description of everything thats been going on:

http://www.jeepforum.com/forum/f310/...-help-1469320/

SeriousOffroad

Error codes are generated by the PCM, not the sensors.

Error codes are result of an signal from a sensor outside of the normal parameters that programmed into the PCM itself.

Although a bad connector can cause problems, it will generally cause an Error Code due to a faulty signal. High resistance across a set of contacts can cause a voltage drop. The PCM would see just the lower voltage and report it as an Error Code.

Has anyone suggested a plugged cat?

janowsky

no, what would be the symptoms of this and how would i check for it?

SeriousOffroad

The only way to know for sure is to remove it and look at it.

Had an emissions test recently?

janowsky

nope. there's no other way to check though? wouldnt somebody have noticed this by now?

janowsky

looks like the dealership actually checked my cat to see if it was clogged. they claim to have narrowed it down to exactly what i mentioned in the first post...so back to my original question, if i buy new oxygen sensors does that come with the connectors i need?

coloradojeepxjowner

Should be plug and play

dave1123

New sensors come with the sensor side of the plug. He's probably talking about the harness side of the connectors which will require splicing the wires into the harness. These should be soldered because of the low voltage signals involved. If you are good with electronics, you could do this yourself. Just make sure your splices are moisture tight.