Intake Manifold Pressure Sensor/Transducer
Indicates an issue with the intake manifold pressure sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The intake manifold pressure sensor measures the air pressure in the manifold. If it fails, the engine might not know how much air is getting in, and that can mess up the fuel mixture and engine performance.
What the computer is actually seeing
The ECM uses voltage signals from the MAP sensor, typically varying from 0.5V (low pressure) to 4.5V (high pressure), corresponding to engine load and performance.
What a healthy reading looks like
Normal pressure readings should vary between 30 kPa to 100 kPa at idle, depending on engine design and altitude.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check for visual damage or disconnection of the MAP sensor connector and wiring. Repair as necessary. Decision: If repairs aren't needed, proceed.
- 22. Measure voltage at the MAP sensor connector with the engine running. Expect 0.5V to 4.5V. Decision: If voltage is within range, proceed. If not, replace the sensor.
- 33. Inspect for intake manifold leaks by applying a smoke test or spraying carb cleaner around the intake. Decision: If the leak is found, repair it. If not, proceed to the next step.
- 44. Use a scan tool to clear the code and take the vehicle for a test drive to see if the code returns. Decision: If the code reappears, replace the MAP sensor.
Common causes
- Faulty intake manifold pressure sensor
- Wiring issues or poor connections
- Vacuum leaks in the intake system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 4142 active?
It's moderate severity; while it may be drivable, performance and emissions can be affected. Fix soon.
Can this code come back after repairs?
Yes, if the root cause wasn't properly addressed or if the sensor is faulty again.
Why does this code link with other SPNs?
Related codes often indicate issues with different sensors or components in the intake manifold pressure system.
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