My 2004 Nissan Maxima is pulling up codes P1800, P1574, P1148. What parts do i need to change. Theres a misfire

SOURCE: I have several codes in my Nissan Titan

lambda probes are fitted between the exhaust manifold and the first box(cat)cannot miss them as no other part of the exhaust system has wires coming out of it.

SOURCE: getting a bad speed sensor

This sensor is located on the transmission.P1574 is the ASCD Vehicle Speed Sensor so it would be relative to your speedo problem.
Possible Causes:
*Harness or connectors
(The CAN communication line is open or
shorted.)
*Harness or connectors
(The combination meter circuit is open or
shorted.)
*TCM
*Combination meter
*Vehicle speed sensor
*ECM

Possible Causes for P0462 (Fuel Level Sensor):
*Harness or connectors
(The CAN communication line is open or
shorted)
*Harness or connectors
(The sensor circuit is open or shorted)
*Combination meter

SOURCE: 2002 Nissan Altima P0720, P1574, P0420

I have a 2002 Nissan Altima. Can anyone tell me what these codes are? And how to fix them? P0420

ZJ Limited

• 17989 Answers
• Posted on Aug 01, 2011

SOURCE: 2002 nissan maxima, check engine

About DTC P1800, I suggest check the harness and verify it is plugged in and still functioning. Also, try checking your vac tubes to verify that they are not reversed. Also read this TSB with details about correct diagnostic: DTC P1800 VIAS CONTROL SOLENOID VALVE

The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.

DTC detecting condition:
• An excessively low or high voltage signal is sent to ECM through the valve
Possible cause:
• Harness or connectors (The solenoid valve circuit is open or shorted.)
• VIAS control solenoid valve

Will need replaced the solenoid valve (P/N - 149558J10A). The valve is located under the engine cover. It's a Nissan only part so you have to order from the dealer, either online or in person. It's cheaper online. Check this sample Nissan engine location (click image for zoom)...





DTC P1147 - Bank1 Sensor 2 O2 sensor maximum voltage monitoring
Component Description: The heated oxygen sensor 2, after three way catalyst, monitors the oxygen level in the exhaust gas on each bank.

Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2.

This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

DTC detecting condition: The maximum voltage from the sensor is not reached to the specified voltage.

Possible cause:
Harness or connectors (The sensor circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure
Injectors

Majority of cases this is either a faulty O2 sensor, or short/open in wiring harness. Bank1 sensor2 is the rear O2 sensor on the passenger (right) hand side (click image for zoom):



Here is simple test with voltmeter to test O2 sensor. If it fails test, replace sensor. If not, then you will have to start tracing the wiring harness for a short/open in it (click for zoom):



And here additional details: DTC P1147 O2 Sensor

Keep us updated.

SOURCE: p1574 nissan maxima

P1574 Throttle Position Sensor Disagreement btwn Sensors, obd2 scanner can help to turn off the light.