Help with ECU problems

First of all, I have to give mad props to everyone on this board. I'm not that knowledgeable about cars but you guys have helped me out A LOT!!!

Not the Problem. I just checked my ECU to find out what the check engine light was on for. This is what I got:

3-2 ENG system Hi/Low flow
7-7 Rear Heated O2 Sensor
3-4 Knock Sensor

I'm guessing 7-7 just means I need a new O2 sensor, and I read about people getting the knock sensor because of not putting premium gas in their car (I just got this car last week so I'm assuming that's what the previous owner may have done) so that can be fixed by letting the old stuff burn out and using 91. The one I don't understand at all is 3-2. I've never heard of that. Is it a serious problem? What should I do? And where does a O2 sensor go?

First of all, I have to give mad props to everyone on this board. I'm not that knowledgeable about cars but you guys have helped me out A LOT!!!

Not the Problem. I just checked my ECU to find out what the check engine light was on for. This is what I got:

3-2 ENG system Hi/Low flow
7-7 Rear Heated O2 Sensor
3-4 Knock Sensor

I'm guessing 7-7 just means I need a new O2 sensor, and I read about people getting the knock sensor because of not putting premium gas in their car (I just got this car last week so I'm assuming that's what the previous owner may have done) so that can be fixed by letting the old stuff burn out and using 91. The one I don't understand at all is 3-2. I've never heard of that. Is it a serious problem? What should I do? And where does a O2 sensor go?

Vehicle type, year, miles??? Please.

Reset ECU by taking batt off for 30min. If the codes return, smtg has to be done.

For codes goto:
www.autozone.com, free login
FSM: http://carfiche.com/manuals; about 50Mb.

Taking it to stealership will cost honey. I would replace the sensors or find a place which will do it, and only that. Then proceed...

ECU is a lottery machine and the environment is growing ground for myriad problems.
Check: http://www.cardomain.com/memberpage/748507/14

Vehicle type, year, miles??? Please.

Reset ECU by taking batt off for 30min. If the codes return, smtg has to be done.

For codes goto:
www.autozone.com, free login
FSM: http://carfiche.com/manuals; about 50Mb.

Taking it to stealership will cost honey. I would replace the sensors or find a place which will do it, and only that. Then proceed...

ECU is a lottery machine and the environment is growing ground for myriad problems.
Check: http://www.cardomain.com/memberpage/748507/14


I have a 95 Maxima GLE with 141k on it

I disconnected my battery for 30min like you said and got a 5-5 -- No Failure Recorded/Detected. Thanks for the help

I disconnected my battery for 30min like you said and got a 5-5 -- No Failure Recorded/Detected. Thanks for the help

Me: Nice to hear.

StealerShip: Youre welcome anytime;
- code clear job 150$
- installed & tested new MAF 900$...
- totAll: 1050$

After driving the car for about a week, the light came back on and I have 2 problems:

7-7 Rear Heated O2 Sensor
3-4 Knock Sensor

Can anyone guesstimate how serious and/or how expensive these things are to fix?

95 Maxima GLE
141K

...95 Maxima GLE 141K

The problem is, that err codes seldom are right. Basic maintenance should be done first.

After basic maintenance, electronics maintenance to get the ECU lottery machine inputs working:
clic:
http://www.cardomain.com/memberpage/748507/14
http://www.cardomain.com/memberpage/748507/10
test all sensors http://www.cardomain.com/memberpage/748507/9

If errors appears after this, then replace:
O2 50$, easy job. KS 100-150$, lots work. Start by asking price from stealeship, but dont go there.

Btw. KS is easy to bypass for tst purposes with 0.5MOhm resistor; high octane gase must be used.

.