P0107 on 2018-2025 Toyota Camry Hybrid: MAP Sensor Circuit Low Causes and Fixes

What's Unique About the 2018-2025 Toyota Camry Hybrid

The A25A-FXS engine in the XV70 generation Camry Hybrid 🎬 Watch: Step-by-step MAP sensor service for your Camry Hybrid uses a MAP sensor that is mounted to the side of the intake manifold and connected via a small vacuum hose. A notable and very common issue on this platform—and across the entire A25A-FXS engine family (RAV4, Highlander, etc.)—is that the small opening in this hose or the port on the manifold can become clogged with carbon or oil deposits from the PCV and EGR systems. This blockage can cause an incorrect (low) pressure reading, leading to the P0107 code even if the sensor itself is functional. Therefore, cleaning the sensor and its port is a crucial first diagnostic step before considering replacement.

Symptoms You May Notice

• Check Engine Light is on
• Rough or erratic idle
• Hesitation or lack of power during acceleration
• Decreased fuel economy
• Engine may stall, especially at idle
• Black smoke from the exhaust in some cases

Most Likely Causes

1. Clogged MAP Sensor Port or Vacuum Hose 🔴 High Probability → Shop Vacuum Hose The sensor connects to the intake via a small hose, and the port is highly susceptible to blockage from oil vapor and carbon buildup from the PCV and EGR systems over time. This is a widely documented issue on the A25A-FXS engine.
   How to confirm: Remove the sensor and the hose. Visually inspect the hose and the port on the intake manifold for blockages. The opening is very small and can be easily clogged. Probe the port gently with a small pick or piece of wire to feel for a hard carbon blockage.
   Typical fix: Carefully clean the sensor tip, the vacuum hose, and the manifold port using Mass Airflow (MAF) sensor cleaner. Do not use harsh chemicals like brake cleaner. A small pick, paperclip, or micro drill bit (turned by hand) can be used to gently break up and remove hard carbon deposits from the port. Ensure the passage is completely clear 🎬 See how to properly clean the sensor and port before reassembly.
   Est. part cost: $5-$15 for cleaner
2. Failed Manifold Absolute Pressure (MAP) Sensor 🟡 Medium Probability → Shop Manifold Absolute Pressure Sensor Electronic sensors are wear items that can fail over time due to heat cycles and internal component degradation. This is the next most likely cause if the port is confirmed to be clear.
   How to confirm: After confirming the wiring is good and the port is clear, test the sensor. With the key on and engine off, the signal wire should show a voltage that corresponds to atmospheric pressure. At idle, the voltage should drop significantly. If the voltage is stuck below 0.5V, the sensor is bad.
   Typical fix: Replace the MAP sensor. It is held on by a single 8mm bolt.
   Est. part cost: $180-$250
3. Wiring or Connector Issue ⚪ Low Probability
   How to confirm: Inspect the MAP sensor connector for corrosion or damage. Unplug the connector and check for 5V reference voltage and a good ground with a multimeter. Check the signal wire for a short to ground. Wiggle the harness while testing to check for intermittent connections.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the connector pigtail.
   Est. part cost: $10-$50

Rare But Worth Checking

• Faulty Engine Control Module (ECM): → Shop Engine Control Module (ECM) This is extremely rare. The ECM should only be considered after all other possibilities, including the sensor, wiring, and any blockages, have been definitively ruled out.

Diagnosis Steps

1. Connect an OBD-II scanner and confirm P0107 is the primary code. 🎬 Watch: A simple guide to diagnosing MAP sensor codes Check the freeze frame data to see the conditions when the code was set.
2. Using live data on the scanner, observe the MAP sensor voltage with the key on, engine off. It should read near 5V. At idle, it should drop to around 1.4-1.8V. If it's stuck below 0.5V, a circuit low condition is confirmed.
3. Turn off the vehicle. Locate the MAP sensor on the side of the intake manifold.
4. Disconnect the electrical connector. Inspect for corrosion or damage. With the key on, use a multimeter to verify the presence of a 5-volt reference wire and a good ground wire in the connector.
5. If power and ground are good, turn off the vehicle. Remove the single 8mm bolt holding the sensor.
6. Carefully twist and pull the sensor to detach it from its vacuum hose.
7. Inspect the sensor's nozzle, the vacuum hose, and the port on the intake manifold for any carbon buildup or blockages.
8. Crucial Step: Clean the port, hose, and sensor tip. Use MAF sensor cleaner and a soft brush. For the port on the manifold, use a small pick, a straightened paperclip, or a micro drill bit *turned by hand* to gently scrape out any hard carbon deposits. Spray with cleaner and use compressed air to ensure the passage is completely clear. Allow it to dry completely.
9. Reinstall the sensor, clear the code, and perform a test drive. Watch the live MAP data on the scanner to ensure it responds correctly to throttle changes. If the code returns, the MAP sensor itself is likely faulty.
10. If the problem persists after replacing the sensor, perform a continuity test on the signal wire between the ECM and the sensor connector to rule out a short to ground in the harness.

Parts You'll Likely Need

• Manifold Absolute Pressure (MAP) Sensor (OEM #89421-06020 (replaces 89421-33010)) — This is the most common part to be replaced for a P0107 code, though it should only be done after confirming the port is clear and wiring is intact.
  Trusted brands: Toyota (Genuine OEM), Denso, Standard Motor Products
  OEM price range: $230-$330
  Aftermarket price range: $70-$150

Related Codes That Often Appear With This One

• P0108 — P0108 is 'MAP Sensor Circuit High Input.' Seeing it with P0107 could indicate an intermittent wiring problem or a sensor that is failing erratically, with the signal fluctuating between open and shorted conditions.

Platform-Specific Known Issues

• High Incidence of Clogged MAP Sensor Port: → Shop Manifold Absolute Pressure Sensor The A25A-FXS engine is known for carbon and oil deposits from the PCV/EGR systems blocking the very small vacuum port for the MAP sensor. This creates a false low-pressure reading, triggering P0107 even with a perfectly functional sensor. Cleaning this port is the most important and vehicle-specific diagnostic step.

Mechanic-Grade Diagnostic Values

• MAP Sensor Signal Wire Voltage (Key On, Engine Off) — expected: ~4.5 - 5.0 Volts. Failure: A reading below 4.5V may indicate a sensor or wiring issue. A reading below 0.5V confirms the P0107 fault condition.
• MAP Sensor Signal Wire Voltage (Engine at Idle) — expected: ~1.4 - 1.8 Volts. Failure: Voltage stuck below 0.5V or above 2.0V at idle. The voltage should drop immediately from the KOEO reading upon starting the engine.
• MAP Sensor 5V Reference Wire Voltage — expected: 4.8 - 5.2 Volts (Constant). Failure: Voltage significantly lower than 4.8V or missing entirely indicates a problem with the ECM or the wiring, not the sensor itself.
• MAP Sensor Ground Wire Resistance — expected: Less than 10 Ohms to chassis ground.. Failure: Resistance above 10 Ohms indicates a poor ground connection, which can cause incorrect sensor readings. Some technicians prefer to see less than 100 millivolts on the ground wire during a voltage drop test.
• MAP Sensor Internal Resistance (Bench Test) — expected: ~2.4 kOhms. Failure: A reading that is significantly different, open (OL), or shorted (0 Ohms) indicates a failed sensor.

Scan Tool Commands That Help

• Toyota Techstream (GTS): Data List -> Powertrain / Engine / All Data -> MAP — Use this to view the live intake manifold pressure reading in kPa as seen by the ECM. With the engine off, this value should be close to the Barometric Pressure value. At idle, it should drop significantly. A value stuck at 22 kPa or lower may indicate the open/short circuit condition that triggers P0107.
• Toyota Techstream (GTS): Utility -> Powertrain / Engine / All Readiness — After a repair, use this function and input DTC P0107 to check if the diagnostic monitor has run and completed successfully ('STATUS is NORMAL'). This confirms if the ECM has re-verified the circuit and that the fault is no longer present.

Wiring & Ground Locations

• MAP Sensor Connector — On the MAP sensor itself, located on the passenger side of the intake manifold.. This 3-pin connector provides the 5V reference, ground, and signal return for the sensor. Corrosion or damage here is a primary cause of circuit faults. The pins can be identified using a multimeter: one will have 5V, one will have continuity to ground, and the third is the signal wire.
• Engine Block Ground (e.g., C6) — A primary ground point for the engine harness is typically located on the cylinder block or head. While not a direct ground for the sensor (which grounds through the ECM), a poor main engine ground can introduce electrical noise and cause issues for all engine sensors.. Ensuring the main engine-to-chassis ground straps are clean and tight is a crucial step in diagnosing any persistent or intermittent electrical fault code.

OEM Part Supersession History

• 89421-33010 → 89421-06020 — Standard part revision and consolidation by the manufacturer.
  Heads up: The two parts are interchangeable, but 89421-06020 should always be used for replacement as it is the latest version.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Low-Pressure Fuel Pump Failure 🔴 High — Common on 2018-2020 models. Can cause engine stalling while driving. (Ref: NHTSA Campaign Number: 20V012000 (Toyota Recall 20TA02))
• EGR System Clogging / Cooler Leak 🟠 Medium — A known issue on the Dynamic Force engine series. Clogging can occur closer to 100,000 miles, while cooler leaks can cause antifreeze to enter the combustion chambers.
• Premature 12V Battery Failure 🟡 Low — Some owners report the 12V auxiliary battery failing earlier than expected, potentially due to parasitic drain from the Data Communication Module (DCM). (Ref: T-SB-0043-20 (Addresses DCM software update to reduce battery drain))

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For an electronic sensor that is relatively inexpensive new from aftermarket sources, buying used is generally not recommended. The primary cause of failure is either internal electronics or external clogging. A used part carries a high risk of having the same issues. It would only be a viable option if sourced from a very low-mileage (<30,000 miles) wrecked vehicle at a very low cost.

Donor-vehicle mileage cap: roughly under 30000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Verify the donor vehicle's low mileage.
• Inspect connector pins for any signs of corrosion (green or white powder).
• Ensure the plastic housing is free of cracks or physical damage.
• Avoid parts from vehicles with engine fires or flood damage.

OEM-only on this vehicle (don't cheap out):

• Engine Control Module (ECM)

Aftermarket brands forum-validated for this vehicle:

• Denso (often the original OEM manufacturer for Toyota)
• Standard Motor Products (SMP)

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' parts from major online marketplaces that are priced significantly lower than reputable aftermarket brands.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0401 — Often related to EGR system clogging, which contributes to the carbon buildup that blocks the MAP sensor port in this vehicle.
• P0171 — A lean condition code that can be triggered by the same intake manifold deposits or vacuum leaks affecting the MAP sensor.
• P0300 — Random misfires can occur due to the rough idle and engine stalling symptoms associated with a failed or clogged MAP sensor.

Frequently Asked Questions