P0734 Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Possible Cause

By far the most common cause of thisP0734code is from worn or defective transmission shifter components. Other causes may include a defective range sensor, open, shorted, corroded, or otherwise damaged wiring and/or electrical connectors.

Common Symptoms

  1. If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in both circuits
  2. If the resistance level does not decrease with heat and increase as it cools, replace the sensor. If everything has checked out thus far, turn the key to the "ON" position and test for the presence of a voltage (and a ground signal) at the exhaust gas temperature/pressure (or heated oxygen) sensor electrical connector
  3. The PCM will read the sensor resistance and pass it
  4. If the fuel shutoff switch and all system circuitry checks out, suspect a defective PCM (or other related controller)

Similar Problems

Vehicle Speed Control And Idle Control System
Crankshaft Position Sensor Circuit Performance
Transmission Control Module Reprogrammable Memory

P0734 Troubleshooting

If this is the case with the code, you will be hearing very loud noises, like explosions, from the rear of the vehicle upon acceleration. Firstly check the carburetor to ensure that the fuel and air combination are properly balanced. If these settings are correct, then thoroughly inspect the distributor cap for any cracks or hairline splits, as this can produce a backfire. Move on to the spark plugs and ensure that they are clean and undamaged and inspect the engine gaskets for any sign of damage, as they are responsible for ensuring the correct gas exchange within the engine. P0734 OBD2 reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.

How to turn off P0734 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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