P1646 Code Sub Fuel Pump Relay?
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Joined: Jun 2012
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From: Louisiana
Yes, P 1646 Came Back!!
It was not the fuel pump relay.
And, yes, it is the upstream O2 sensor on the passenger bank.
Thank you all for spotting this.
Awaiting arrival of Denso sensor on Tuesday. Then code-free driving!
And, yes, it is the upstream O2 sensor on the passenger bank.
Thank you all for spotting this.
Awaiting arrival of Denso sensor on Tuesday. Then code-free driving!
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Harvsteve
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
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Aug 5, 2025 09:07 PM
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