# 2004 Nissan Xterra overheating, losing power

**URL:** <https://community.cartalk.com/t/2004-nissan-xterra-overheating-losing-power/130597>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, xterra\
**Created:** [December 10, 2018, 8:49pm UTC](https://community.cartalk.com/t/2004-nissan-xterra-overheating-losing-power/130597 "2018-12-10T20:49:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Teri56](https://avatars.discourse-cdn.com/v4/letter/t/46a35a/32.png) [@Teri56](https://community.cartalk.com/u/Teri56)\
**Post date:** [December 10, 2018, 8:49pm UTC](https://community.cartalk.com/t/2004-nissan-xterra-overheating-losing-power/130597/1 "2018-12-10T20:49:58Z")

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1st sign of problem 3yrs ago , overheated , lost power, had to be towed. no problem again until 4 mo. ago Overheating, losing power. have replaced fuel pump, water pump, radiator, fan thermostat, alternator. FIXD is saying Knock Sensor Circuit High, input Bank 1P0328 Severity level high ? My husband doesn’t believe FIXD, yet everything his mechanics have done, hasn’t solved problem. Anyone know ?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [December 10, 2018, 9:03pm UTC](https://community.cartalk.com/t/2004-nissan-xterra-overheating-losing-power/130597/2 "2018-12-10T21:03:30Z")

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> [@Teri56](#):
>
> My husband doesn’t believe FIXD

Why? The code IS what it IS. It is just a tool to read engine codes and any code reader would give the same answer. It IS a hint that the knock sensor is getting a signal much higher than it should. Some of the causes could be:

- Damaged knock sensor connector
- Open or shorted to ground knock sensor circuit
- Shorted to voltage knock sensor circuit
- Loose knock sensor
- Damaged knock sensor
- Low fuel pressure
- Wrong fuel octane
- Circuit experiencing electrical interference
- Mechanical engine problem
- Overheating engine
- Failed PCM (rare)

Notice overheating could be the cause of the code. A bad head gasket might cause the overheating which then sets the code. Overheating 4 years ago may have weakened the head gasket on bank 1 and now its failed.

Has any mechanic run a pressure check on the cooling system? Or checked for bubbles or oily residue in the overflow tank? Or run a compression or leakdown test? If they haven’t, you need to find a better mechanic.