CODE P0193 all that was left?

Tiny
BHAMDOC1
  • MEMBER
  • 2008 MERCEDES BENZ E63 AMG
  • V8
  • 2WD
  • AUTOMATIC
  • 171,000 MILES
Initially had a bunch of codes, among them p2540. Deleted all and all that was left was p2540. Changed the sensor on top of the fuel tank, deleted the code. Without a check engine light saw a p0193. It's an auction car, but I only added maybe $20 worth of gas in it, 93 unleaded. No misfires, engine sounds ok.
Thursday, January 15th, 2026 AT 11:20 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 15,411 POSTS
OK that code is for the fuel rail pressure sensor. With the engine at idle toss a scan tool on it and see what the PCM is asking for in fuel pressure VS what the sensor is showing as fuel pressure. Are the values different? Yes - test the voltage at the sensor between pins 1 and 3, you want to see 4.8-5.3 volts. If the values are wrong and the voltage is OK, replace the sensor.
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Thursday, January 15th, 2026 AT 8:42 PM

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