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Hello, I have a 1996 nissan altima gxe automatic with 174,500 miles. The check engine light has been on sense before the last owner bought the car and I got it checked. Here are the codes: P0340 camshaft position sensor
P0325 knock sensor
P0335 crankshaft position sensor circuit
P0720 output shaft speed sensor circuit
P0734 gear 4 ratio incorrect
P0130 oxygen sensor circuit
Cleared codes and camshaft didn’t come back
Now there is pretty bad hesitation when accelerating. I was told the motor mounts are bad and there’s a leak in the exhaust flex pipe. I don’t know what to do or where to start or anything really.. Any help is greatly appreciated! Thanks!
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Did all of the other codes come back? The 700 level errors are transmission related. I have seen transmission errors and changing of trans fluid has corrected it. Then again, I have seen where it does not.
As far as the other errors, just like the 700 errors, it would be good to know what comes back, especially since you have a hesitation now. The best thing you can do, in my opinion, is try to knock them out one by one and it may correct multiple errors in the process.
All of them but the camshaft sensor came back. I was wondering if there may be an electrical problem as it says circuit for all of the sensors.
You have some serious codes there. Mainly the transmission codes I’m concerned about. Transmission problems can cause performance issues, including hesitations. Given that might be your most expensive fix, I would pursue that first. You may even want to take it to a transmission shop to be diagnosed as the codes you have indicate that you might need a transmission. More info in these articles.
http://www.ericthecarguy.com/faq/solving-transmission-problems
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Good luck and keep us posted.
You have a few codes that indicate a few circuits have gone bad. I’d think it’d be worthwhile checking your fuses to see if any have blown. In my experience, a blown fuse is more likely than a failed circuit, especially considering that one fuse can cover many systems.
I checked all fuses with a multimeter ad they are all good. I noticed that the 2 ABS fuses are gone, and that some of the prongs are missing where one would go. I’m guessing that is a problem that I wasn’t informed of..
…or it means you don’t have ABS.
With so many sensor codes, I would start by looking for an electrical problem. You need to start with a factory service manual or something like alldata DIY (which is relatively cheap), so you know what to look for on those circuits. You’ll have to decide for yourself if you have the ability to do this.
I don’t know how Nissan’s work, but Chrysler has a couple sensor circuits on which the computer supplies a 5 volt reference voltage or an 8 volt reference voltage. As an example, a short to ground on the reference circuit could bring down all the sensors at once.
okay, now i posted another topic a little while back, when i accelerate to about 2000+ rpms the temp gauge drops and dances around until I let off, then jumps right back up. Maybe that’s related?
Maybe. Here’s where factory wiring diagrams can help you see connections. Also, dancing gauges can mean you have power that’s not clean– that can cause all kinds of crazy issues. Make sure your battery is good, make sure your battery and ground connections are also good and corrosion free. Find the engine ground strap too, make sure its good. A bad alternator diode is another possible source of messy power (AC ripple).
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