Check Engine Codes ('96 S14)

[Asmar]

I am getting the following check engine codes on my '96 S14:

P0135 - O2 Heater Circuit (Bank 1, Sensor 1)

P0443 - Evaporative Emission System Purge Control Valve Circuit

I just had my car fixed about 3 months ago when it was getting the following codes:

P0443 - Evaporative Emission System Purge Control Valve Circuit

P1400 - Differential Pressure Feedback EGR Circuit Low Input

The car has only 66K miles on it and has been a pain in the *** ever since I got it... This same type of problem keeps coming back. This is the 3rd time I've had to deal with the problem. I have spent over $1,500+ now and still more to come on this problem. Anyone have any clue what the **** is up with my car? How can I fix this problem? I'm getting real tired of this... ANY help would be nice.

I used this thing to get my codes:



Thanks for your time!

[driftingmy240sx]

was the purge valve replaced by you or a shop? i have seen the evap canister seperate and the charcoal gets sucked into the purge line and valve. its easy to check for, just remove the purge hose from the vavle that comes from the canister and look for little peices of debris in the line.

the o2 code sounds like you need and o2 sensor. the one you need to replace is the one in the manifold.

[boriquaS13]

So what did they do for 1500 bucks?

As driftinymy240sx said the oxygen sensor heater ckt is probably open giving you that po135.

Now did the shop do any repair on the evap system?

[Asmar]

was the purge valve replaced by you or a shop? i have seen the evap canister seperate and the charcoal gets sucked into the purge line and valve. its easy to check for, just remove the purge hose from the vavle that comes from the canister and look for little peices of debris in the line.

the o2 code sounds like you need and o2 sensor. the one you need to replace is the one in the manifold.

I had it replace by a shop, twice. Do you have any pictures of the area your talking about to check? I think that might be the problem... Thank you very much for your reply.

[Asmar]

So what did they do for 1500 bucks?

As driftinymy240sx said the oxygen sensor heater ckt is probably open giving you that po135.

Now did the shop do any repair on the evap system?

Well apparently they "fixed" the problem even though it came back. I just got the O2 sensor check saying it was good. The guy told me to get the P0443 problem fixed and then the P0135 showed go away. Does that sound like something that may be possible? Because according to him the O2 sesor is in 100% perfect working condition. And thanks for your reply.

[boriquaS13]

I just don't see how thats possible, because it isn't, take your car somewhere else. po135 heater ckt malfunction has absolutly nothing to do with po443 purge control solenoid malfunction. Heated oxygen sensors have four wires or three, in your case should have four wire oxygen sensor 2 of the four are just for the heater portion of the oxygen sensor 90% of the time the heater ckt in the oxygen sensor goes open hence giving you the po135. Now for the po443 it needs to be dug into further obviosly the person you had look at this problem doesn't know what to do to fix it, so again take it somewhere else. Good luck

[coupe240sxguy]

the P0443 usually means bad gas cap, but it may not be the problem. It can be as simple as a vacumn line unhooked, colapsed, or cracked.

[Asmar]

I just don't see how thats possible, because it isn't, take your car somewhere else. po135 heater ckt malfunction has absolutly nothing to do with po443 purge control solenoid malfunction. Heated oxygen sensors have four wires or three, in your case should have four wire oxygen sensor 2 of the four are just for the heater portion of the oxygen sensor 90% of the time the heater ckt in the oxygen sensor goes open hence giving you the po135. Now for the po443 it needs to be dug into further obviosly the person you had look at this problem doesn't know what to do to fix it, so again take it somewhere else. Good luck

Took it to 2 different places, they said the same thing. What your saying makes more sense though. I'm just gonna take it to Nissan I guess... If they can't fix it, no one can...

[Asmar]

the P0443 usually means bad gas cap, but it may not be the problem. It can be as simple as a vacumn line unhooked, colapsed, or cracked.

Yeah I checked the gas cap, its good. I'm just gonna take it into Nissan to get it fixed, I'm so tired of this. Thanks for your help though.

[Asmar]

Anybody else ever had or heard of this type of problem?

[jmauld]

I've got this same problem and I've been unable to fix it. Did you have any luck?

According to the manual, the sensors indicated by the codes all share the same power line, which in my car doesn't have power. I've been unable to trace the wire back to the source.

[Q45tech]

As an independent shop that works on only Infiniti and Lexus we learned long ago that repetition of repairs brings expertise.

The point is bring it to an expert who works on your model and year every day or at least once per week. The country is full of shadetree generic mechanics.

[jmauld]

Looks like the power line was broken somewhere in the harness. Replaced that line with a new one and the codes are gone.