hvac

AC Pressure Sensor

for 2021 Toyota Camry 2.5L I4 · FWD

Difficulty

Moderate

Time

30 min

Tools

Steps

This procedure covers the replacement of the AC pressure sensor (high or low side) on a 2018-2024 Toyota Camry with the 2.5L I4 engine, including refrigerant recovery and recharge.

Warnings

⚠️AC refrigerant can cause frostbite and blindness. Always wear safety glasses and gloves when working with AC systems.

⚠️Never mix R-134a and R-1234yf refrigerants. Verify refrigerant type on underhood label before recovery and recharge.

⚠Do not open AC system without properly recovering refrigerant. Venting refrigerant to atmosphere is illegal and environmentally harmful.

⚠Work in a well-ventilated area. R-1234yf is mildly flammable and should not be exposed to open flames or extreme heat.

ℹ️This vehicle may be equipped with either R-134a or R-1234yf refrigerant depending on production date. Verify refrigerant type before beginning work.

Tools required

AC refrigerant recovery machine (R-134a or R-1234yf compatible)Essential

Torque wrench (5-30 Nm range)Essential

10mm socketEssential

Ratchet and extensionEssential

AC vacuum pumpEssential

AC refrigerant scaleEssential

Safety glassesEssential

Nitrile glovesEssential

Refrigerant identifier tool

Parts

AC pressure sensor × 1 — 88719-06020 (high side) or 88719-02020 (low side)
AC line fitting O-rings × 2 — Use OEM specification
R-134a or R-1234yf refrigerant × 1 — Verify system type on underhood label
PAG oil (ND-11 or ND-12) × 1 — Use OEM specification

Preparation

Verify refrigerant type on underhood AC specification label (R-134a or R-1234yf)
Park vehicle on level surface and apply parking brake
Turn ignition off and remove key
Allow engine to cool completely if recently driven
Identify which pressure sensor requires replacement (high side located on AC line near firewall, low side located on suction line near accumulator)

Procedure

1
Recover AC refrigerant
Connect AC recovery machine to both high and low side service ports. Follow recovery machine instructions to completely recover all refrigerant from the system. Record the amount recovered for reference during recharge. Ensure recovery is complete before proceeding.
⚠️Use only equipment rated for the specific refrigerant type in your vehicle. Cross-contamination can damage AC system.
2
Access the pressure sensor
For high side sensor: locate sensor on AC line near firewall between condenser and evaporator. May require removing engine cover by pulling upward on clips. For low side sensor: locate on suction line near accumulator on passenger side of engine bay. Clean area around sensor with clean cloth to prevent contamination.
3
Disconnect electrical connector
Press down on the locking tab of the electrical connector and pull straight off the pressure sensor. Do not pull on wires. Inspect connector for corrosion or damage.
4
Remove pressure sensor
Using a 10mm socket, carefully unscrew the pressure sensor from the AC line fitting. Turn counterclockwise to remove. Some residual refrigerant or oil may be present. Once removed, immediately cap or plug the open port to prevent contamination.
⚠A small amount of residual refrigerant may escape when removing sensor. Work in ventilated area.
5
Inspect and prepare fitting
Inspect the AC line fitting threads and sealing surface for damage or corrosion. Remove and discard old O-ring from sensor port. Clean sealing surface with lint-free cloth. Install new O-ring onto sensor port, ensuring it seats properly in the groove.
6
Apply PAG oil to O-ring
Apply a thin coat of fresh PAG oil (ND-11 for R-134a systems, ND-12 for R-1234yf systems) to the new O-ring. This ensures proper sealing and prevents O-ring damage during installation.
7
Install new pressure sensor
Thread the new pressure sensor into the AC line fitting by hand, turning clockwise. Ensure it threads smoothly without cross-threading. Once hand-tight, use torque wrench with 10mm socket to tighten to specification.
⚠Do not over-tighten. Excessive torque can damage threads or crack the sensor body.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
8
Reconnect electrical connector
Push the electrical connector onto the new pressure sensor until the locking tab clicks into place. Gently tug on connector to verify it is locked securely.
9
Evacuate AC system
Connect AC vacuum pump to service ports. Evacuate system to at least 29 inches of mercury (98 kPa vacuum) and hold for minimum 30 minutes. Monitor for vacuum decay which would indicate a leak. If vacuum holds steady, system is ready for recharge.
⚠Proper evacuation removes moisture and air from system. Insufficient evacuation can cause AC performance issues and compressor damage.
10
Recharge AC system
Using AC refrigerant scale and charging equipment, recharge system with the amount of refrigerant recovered in step 1, or per underhood specification label (typically 425-475 grams for R-1234yf or 500-550 grams for R-134a). Charge through low side port only with engine running at 1500 RPM and AC on MAX COLD.
⚠️Never charge through high side port with engine running. This can cause refrigerant can to explode.

Reassembly

Reinstall engine cover if removed by pressing down until clips engage
Close hood and verify no tools or materials are left in engine bay

Verification

Start engine and turn AC to MAX COLD with fan on high
Verify AC compressor engages and cycles normally
Use scan tool to monitor AC pressure sensor readings (high side should read 150-250 PSI with ambient temp 70-80°F, low side should read 25-40 PSI)
Check for cold air from vents (vent temperature should be 40-50°F below ambient)
Inspect sensor area for refrigerant leaks using electronic leak detector or approved leak detection method
Verify no warning lights or AC-related diagnostic codes are present