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Code

P0088

Fuel

Fuel rail pressure too high

The fuel rail pressure exceeds the maximum allowed.

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Most likely causes

Faulty fuel pressure regulator
Blocked return line
Sensor reading wrong

Symptoms you may notice

Check engine light
Rich mixture
Poor economy

Checks to run

Measure rail pressure
Test the regulator
Inspect the return line

Tools you may need

Fuel pressure gauge

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Fuel

Fuel rail pressure too low

Fuel pressure regulator performance

Fuel pump primary circuit malfunction

Fuel rail pressure sensor range / performance

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