My car is VAN NISSAN Quest 1999, there is a light says "Service engine soon". The PCM has determined that a malfunction exists in the electrical circuit for knock sensor 1. Probable Causes: 1. knock sensor defective 2. Ignition system fault-spark plugs,ignition wires, coil 3. Vacuum leak 4. Injector fault 4. High or low fuel pressure. The mechanics told me that I have to replace the knock sensor. is it true or not, thank you,,,
2007-12-29 18:51:53 · 4 answers · asked by khdourcbj 1 in Cars & Transportation ➔ Car Makes ➔ Nissan
The consequences of a failed knock sensor are poor running and uncontrolled knocking in the engine.
That's likely the problem and you should have it replaced.
2007-12-29 18:56:38 · answer #1 · answered by Right Guard 6 · 0⤊ 0⤋
Knock sensor is difficult to change under the intake manifold. and does not cause the Check engie light. Now the other codes seems as if you may be experencing a Distributor problem. How many miles and the symptom would also be helpful. Won't run staling or runs bad?
2007-12-30 02:46:27 · answer #2 · answered by John Paul 7 · 0⤊ 0⤋
most of the knock sensors go right next to the lower portion of the engine block to detect engine knock. look on the side of your block for the sensor
2016-04-02 01:36:40 · answer #3 · answered by Barbara 4 · 0⤊ 0⤋
Technically you don't, but the whole point of the knock sensor is to adjust for variations in octanes, monitor the engine performance, and adjust things accordingly to give you smooth engine behavior.
You can go to another mechanic for a second opinion, but it sounds like you need a good tune-up.
2007-12-29 19:00:39 · answer #4 · answered by T J 6 · 0⤊ 1⤋