21531072 Temperature Sensor | Genuine Volvo Penta Part

🔧 Product Description

Threaded electronic temperature sensor used across later Volvo Penta marine and industrial engines. Depending on the engine schematic, it monitors coolant or the temperature at an exhaust-manifold cooling passage and sends a calibrated signal to the engine control system. The ECU uses the value for protection, alarm, fuelling and temperature display functions.

🚤 Compatibility

• Engine Family: D, TAD
• HP Range: 145-480 HP

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta calibrated temperature sensor
• Single electrical connector with threaded brass sensor body
• Used in D6-G, D8, D11, D13, D16 and TAD applications
• Provides data for ECU protection and alarm strategies
• Related Volvo-group reference 20513340
• Engine type: Electronically controlled turbocharged diesel
• Quantity varies by assembly, most commonly one

🔌 Function

Measures temperature and converts it into an electrical signal for the ECU, alarm system and instrument display.

⚠️ Common Signs of Failure

• Incorrect or fluctuating temperature reading
• False high-temperature alarm or derate
• No temperature indication
• Open-circuit, short-circuit or implausible-signal fault code
• Corroded connector, damaged wiring or coolant seepage at the threads

🛠️ Service Notes

• Check the replacement is the sensor specified for your engine and instrumentation — sensors sharing a thread can have quite different characteristics, and a mismatch gives plausible but wrong readings
• Let the engine cool and depressurise the system before removing a sensor from a coolant or oil passage, and be ready for the fluid that will come out
• Clean the threads and sealing face in the housing, fit a new sealing washer or O-ring where one is used, and do not pack the threads with sealant on a sensor that earths through its body
• Tighten to the figure in the workshop manual with a spanner on the hexagon only — these bodies crack easily and the thread in an alloy housing is easily stripped
• Reconnect the plug or terminal clean and secure, route the lead clear of hot and moving parts, then top up, bleed and run the engine and check the reading is sensible and steady while watching the joint for weeps

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21531072 → Supersedes 20513340 → Supersedes 20450685

OEM / Related Numbers

• 22328781 earlier number superseded by this part
• 20513340 earlier number superseded by this part
• 3589542 earlier number superseded by this part
• 20450685 earlier number superseded by this part

Other-Brand OEM Numbers

• VOE21531072
• VOE20513340
• Bosch: 0 281 002 744

Aftermarket / Verified Equivalents

• Cojali: 2260409
• Bergkraft: BK8400484

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G, D6-480A-G
• Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G, D4-175 VG
• Volvo Penta D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A1-A MP, D8A2-A MP, D8A3-A MP, D8A4-A MP
• Volvo Penta D13C4-A MP, D13B-L MP, D13B-D MP, D13B-M MP, D13B-C MP
• Volvo Penta TAD852VE-B