Sep 252017

Nissan Maxima

Multiple Codes

Car has 152,000 miles. Car idles and revs fine while in park. When driving it clatters and looses power it you give it more than 25% throttle. I took it to Firestone and they did a diagnostic on it and it gave them the following codes:P0420- CATALYST EFFICIENCY BELOW NORMAL (BANK 1)…..P1574-ASCD VEHICLE SPEED SENSOR MALFUNCTION….P0300-MULTIPLE MISFIRE DETECTED….P0720TCM REVOLUTION SENSOR CIRCUIT MALFUNCTION. The mechanic at Firestone said that he does not know why the car is acting like this and referred me to a Nissan dealer. I am trying to avoid that because I know the cost would be astronomical for them to diagnose and fix it. It was running fine and then all the sudden it was like it is possessed. Any ideas?


The code P0420 generally means the catalytic converter isn’t functioning as it should. Now if you have been driving it with a misfire for a while it may have caused a larger issue. The unburnt fuel gets shoved out into the catalytic converter and can cause it to clog. If the converter is clogged it will act as you described. A back pressure gauge is inserted in the front O2 Sensor port to check for this. If there is more than 3 psi at 1500 rpm the converter is clogged. Generally if this is the case the car will perform normal at first and as the engine warms up the performance will fade. I have provided the code information below.

Nissan Code P1574

Description: Automatic Speed Control Device Vehicle Speed Sensor

Code P1574 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty

Nissan Code P0720

Description: Output Shaft Speed Sensor Circuit

Code P0720 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty
  6. Transmission system malfunction

Nissan Code P0420

Description: Catalyst System Efficiency Below Threshold Bank 1

Code P0420 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty
  6. HO2S sensor contamination/damaged
  7. Exhaust leaks or restrictions
  8. Catalytic converter damage
  9. Catalytic converter improper operation

Nissan Code P0300

Description: Random – Multiple Misfire Detected

Code P0300 Probable Causes

  1. Vacuum leaks, damaged hoses or improper routing
  2. Fuel contamination
  3. Ignition system – Ignition module, coil, spark plugs and wires
  4. Fuel system
Sep 182017

2006 Nissan Almera

Will not move

My car starts alright but will not move. The previous day my first and second gears took a long time to accelerate and there was a smell of something burning (clutch probably) after my drive.


Sounds about right. If the clutch is slipping or worn out the vehicle will not want to move. Something you can try. Hold the brake and let out on the clutch pedal. It the engine does not die, the clutch is shot.

Sep 112017

Nissan Titan

Spitting and sputtering

My Nissan Titan if you gassed it one time, would spit and sputter but not die. We would kill it then start it again and it would be fine. Now it slowly progressed and now it’s spitting and sputtering and will actually die on us. We have to kill it and start it back at every stop sign and red light and as were going well have to put it in neutral and kill it too. It acts like either the throttle body, fuel filter or fuel pump is acting up but we’re not sure which it could be.


The first step would be to have any codes pulled and post them. You can get the codes pulled for free at just about any local auto parts store.

Jun 142017

 Nissan Frontier

Replacing the factory transmission cooler

So I was thinking about replacing the factory transmission cooler with an aftermarket trans cooler. I replaced transmission about 2 years ago. I do not want to burn this one up. Should I be doing something different?


Heat is the number one cause for transmission failure. You are thinking along the right lines as far as what can be done for precautionary measures.

You might want to consider making sure both your cooling fan relays are functioning properly as well. In conclusion there is a low and high fan relay.

How to check your cooling fan

The cooling fan will operate at low speed with the power being supplied through the low speed fan relay. Place the air conditioning to maximum and the High speed fan relay should kick in and supply the cooling fan with power. You should be able to see the fan speed increase since it is functioning properly.

Jun 062017

Nissan Altima

Will not start until the engine is cold again

I have a 2003 Altima. It will start without any problems cold. But after driving for a while and turning off the car it will not start until the engine is cold again. I have replaced both cats, o2 sensors, the cam and crankshaft sensors to no avail. Please help if you have any idea what this could be I’m extremely frustrated with this car because I cant figure this out. I’m soon to replace the head gasket and fuel pump but I’m tired of throwing money at this car with no solution.


Jun 062017

2009 Nisan Cube

Check engine light keeps going on and off

My check engine light keeps going on and off, so I went to a mechanic to get a diagnosis. They told me that they found oil contamination on the spark plugs from an internal leak. The spark plug tube seal caused the contamination on the spark plugs and catalytic converter. He’s recommending that in order to get rid of the Service Engine Light I need to replace not only the spark plugs, but the catalytic converter, O2 sensor, gasket plugs, valve cover gasket, exhaust gaskets and etc. In total he’s charging me $2300 for parts and labor. I’m trying to get a second opinion rather than drop all this money without knowing if there’s a cheaper/alternate route. Thank you.


Post the diagnostic codes and we can find the cheapest solution.

Jun 052017

1994 Nissan Pickup D21I have a 1994 Nissan D21 which I have had problems with the horn blowing fuses before. I just recently replaced the horn and everything was working fine for a couple of weeks. A week ago, I was sitting my truck and noticed the Air Conditioning had stopped working, I tried turning the a/c off then on but it still did not work. I turned my truck off and then back on and it came back on. A few minutes later, I drove off and turned the radio up and it stopped playing music but still had power to the radio. The next day, I was backing up, blew my horn and the fuse had blown. When I pulled out on the highway, I realized my turn signals would not work. I tried my flashers and they are working. Any idea of where I need to start looking? I brought it to a mechanic and he sat on it for a week then went on vacation.


Looks like you may need to do some tracing in the wiring. Use the wiring diagram provided to assist in tracing the wiring harness.

Turn Signal Wiring Diagram 1994 Nissan D21 Pickup

1994-nissan-d21-exterior-lights-back-up-turn-lamps-circuit-1-of-1
Apr 112017

Hello,

Nissan Altima

Car jerks on acceleration and deceleration

I got a Nissan Altima 2004, 2.5L. When I let off gas the rpm drops quickly to 1000 and jump to around 1200 and again drop back to 1000.
Also the car jerks on acceleration and deceleration mainly from 1 to 2 or 2 to 1. It looks the
transmission has delayed shifting …
My engine mounts were weak because when I was changing gear from P to R ro N to R the engine used to jerk, I replaced the (except tranny mount) but now after a month I think the mounts are loose again and engine moves a lot.
Do you think the jerky shifting might be caused by a weak or broken tranny mount ? or it’s the solenoid or valve body issue? there is NO light on.
By the way, the jerky shifting is much more noticeable when I accelerate slowly, I don’t feel a jerk if I push the gas pedal with high rpm and high acceleration