Holden VE P0521 code
After some time, a Holden VE can have Oil Pressure issues which I found out is due to a faulty oil pump. This can trigger a P0521 Code.
I thought it was the timing chains, but the issue was still there after replacement. Whilst it was not as bad, it was still pretty annoying when I had spent $2k on timing chain replacement. Between the timing chains being done and then another 18 months, I had a P0521 code triggered with the “Check Engine” error light.
I tried replacing the Oil Pressure sensor as after some research, it was an issue for many. However, in my case it still didn’t fix the problem.
I took it to a new mechanic since I had relocated and they found it was a faulty oil pump. There was a defective valve/flap within the oil pump that was allowing the oil to drain back to the sump and not remain within the system. This meant that upon start-up, it sounded like a truck with the rattle of chains. The symptoms are very similar to timing chain issues.
In hindsight, I should have replaced the Oil Pump when my timing chains were replaced.
Symptoms of P0521 Error
- Check engine light
- Oil pressure warning light
- Oil pressure gauge too high/low
- Engine stall
Causes of P0521 Error
- Faulty Pre-Catalyst oxygen sensor
- Faulty wiring/connections
- Short or open ground in the wiring
- Blown Fuse
- Engine coolant temperature sensor is not operating correctly
- Faulty Power Control Module
