TOYOTA/LEXUS 1210131121 OIL PAN
Product Specifications
Product quality
OEM Equivalent Grade
Wholesale price USD
$48.57
Wholesale price CNY
¥330
bolt MOQ (Minimal order)
1 pcs
local_shipping Production time
20-50 days
package_2 Shipping Weight:
—
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Application (cross references) 1
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| TOYOTA/LEXUS | 1210131121 |
Overview & Operating Principle
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The OIL PAN is an automatic transmission oil pan with integrated filter — a stamped steel or die-cast aluminium sump that forms the lower closure of the automatic transmission housing, serving simultaneously as the reservoir for the automatic transmission fluid (ATF), the mounting base for the internal oil filter, and the structural lower cover of the transmission's valve body cavity. Unlike a simple engine oil pan, the automatic transmission pan is a precision component whose internal volume is calibrated to the transmission's total ATF capacity — the pan depth determines how much fluid remains in the sump when the valve body passages and torque converter are full, and an incorrect pan depth alters the ATF level in a way that cannot be corrected by adjusting the dipstick fill level alone. The integrated filter — a pleated synthetic media or fine-mesh screen element — is retained in a bracket on the pan's inner face that positions the filter inlet tube at the correct height in the ATF reservoir; the filter is the sole protective barrier between the ATF in the sump and the transmission pump's inlet, and its position, inlet height, and flow area are precisely engineered to prevent pump cavitation at minimum ATF level while providing full filtration at all operating temperatures. The pan also incorporates a magnetic drain plug or integrated magnet — a permanent magnet bonded to the pan floor or installed in the drain plug bore — that captures ferrous wear particles from the ATF before they can be re-ingested by the filter and pump circuit, providing an early-warning indicator of internal transmission wear during each oil change service.
This unit — TOYOTA/LEXUS 1210131121 — is manufactured to OEM-equivalent specifications: pan outer dimensions and bolt hole pattern for the transmission housing mating face, pan depth and internal volume for the correct ATF capacity, integrated filter element media and micron rating, filter inlet tube height above the pan floor, magnetic drain plug thread and magnet strength, and pan gasket seating face geometry are matched to the original part. Supplied as a complete assembly including the integrated filter element and drain plug. Available wholesale from 48.57 USD, MOQ 1 pcs, production lead time 20-50 days.
Automatic transmission pans with integrated filters require replacement rather than filter-only service when the pan body is physically damaged from road debris impact — a dented or cracked pan compromises the ATF reservoir volume and may have damaged the filter mounting bracket, misaligning the filter inlet; when the pan gasket seating face is corroded, pitted, or warped from prolonged ATF contamination exposure that makes a reliable reseal impossible; and when the pan's magnet has lost sufficient strength to capture ferrous particles efficiently. In high-mileage service the integrated approach of replacing pan and filter as a single unit at each ATF service interval eliminates the risk of fitting an incorrect filter and ensures the gasket seating surface is renewed at every service.
Symptoms & Diagnostics
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ATF leak from the pan-to-housing gasket — wet ATF staining around the pan perimeter visible from below the vehicle, or an ATF puddle under the transmission after overnight parking — the pan gasket has failed from the gasket material compressing beyond its elastic recovery limit after repeated heat cycles, or the pan bolt tightening sequence was not followed during the previous service; confirm the leak source by cleaning the entire pan perimeter with degreaser and observing for fresh ATF migration after a short drive; replace the pan assembly to provide a new gasket seating surface.
Harsh, delayed, or inconsistent gear shifts that have developed progressively over 10,000–20,000 km — the integrated filter is loaded with friction material and metallic wear particles from clutch pack operation, restricting ATF flow to the valve body and reducing hydraulic pressure; the filter blockage is confirmed by the service history — if the ATF has not been changed and the pan and filter not replaced at the OEM service interval, filter restriction is the primary suspect before any valve body or solenoid investigation.
ATF that is dark brown or black and has a burned smell when checked on the dipstick or pan removal — severely degraded fluid with a significantly elevated contamination level — the filter has been fully loaded and bypassing contaminated fluid for an extended period beyond its service life; the dark fluid indicates the pan, filter, and ATF replacement is overdue and that solenoid valve screens and clutch pack condition require assessment simultaneously.
Significant metallic particle accumulation on the pan's magnetic drain plug or floor magnet at a routine service — more than a thin film of fine iron powder — accelerated internal wear generating metallic debris at a rate above normal; a small amount of fine magnetic powder after 40,000–60,000 km is normal; large flakes, brass fragments, or a thick layer of grey metallic paste indicates a specific internal failure requiring transmission inspection beyond pan and filter replacement.
Visible physical damage to the pan body — dent, crack, or deformation visible from underbody inspection — road debris impact or contact with a road obstruction has damaged the pan; a cracked pan leaks ATF and may have altered the filter mounting position inside; a deeply dented pan may have reduced the ATF reservoir volume, altering the correct fill level; replace immediately to prevent ATF loss and potential transmission failure from incorrect fluid level.
Transmission whining noise at low ATF temperatures that reduces as the fluid warms — the ATF pump is cavitating at cold temperature because the cold, viscous ATF cannot flow through the loaded filter at the pump's inlet demand rate; as the fluid warms and thins, the same filter restriction allows adequate flow and the noise disappears; this temperature-dependent whine is the characteristic cavitation signature of a filter loaded beyond its flow capacity at low temperature.
Logistics & Customs
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International HS Code
8421.23
EAEU Customs Code (TN VED)
8421 23 000 0
Typical Net Weight
Country of Manufacture
China
Standard MOQ
1 pcs
Production Lead Time
20-50 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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- Drain the ATF completely before removing the pan — position a drain tray of adequate capacity beneath the full pan perimeter since pan removal without prior draining releases the full ATF volume suddenly; allow the transmission to cool to below 50°C before removing the pan to avoid contact with hot ATF at operating temperature; use the drain plug where fitted for a controlled drain, or loosen one pan corner bolt carefully to direct the initial ATF flow into the drain tray before removing the remaining bolts.
- Inspect the drained ATF and the pan interior before discarding — pour the drained ATF through a white filter paper or into a clear white container and examine for metallic particles, friction material debris, and colour; normal ATF is reddish-brown with fine magnetic particles on the magnet; large metallic flakes, brass-coloured particles, or black sludge indicate internal damage requiring transmission inspection beyond routine pan service; photograph the pan interior and magnetic catch before cleaning for service record documentation.
- Clean the transmission housing mating face completely before installing the new pan — use a plastic scraper to remove all traces of the old gasket material from the housing face; metal scrapers damage the aluminium housing seating surface and create raised edges that prevent the new gasket from sealing; wipe the cleaned face with brake cleaner on a lint-free cloth and inspect under good lighting for any raised corrosion or dings that would prevent a flat gasket contact — dress any raised areas with a fine flat file before fitting the new pan.
- Install all pan bolts hand-tight before beginning the tightening sequence — the pan gasket must compress evenly across its full perimeter simultaneously; tightening one area before others are engaged distorts the pan and produces a leak at the inadequately compressed section; with all bolts hand-tight, tighten in a diagonal or star pattern in three progressive passes — first pass to 3 Nm, second pass to 6 Nm, final pass to the OEM specified torque typically 8–12 Nm for aluminium transmission housings.
- Refill with the exact OEM-specified ATF type and the precise quantity specified for the pan-and-filter replacement procedure — the ATF volume required after pan removal differs from the total transmission capacity because the torque converter and valve body passages retain fluid; the service data specifies the exact quantity to add after pan replacement separately from the total fill quantity; filling to the dipstick mark without following the specified quantity risks either underfilling — causing pump cavitation — or overfilling — causing aeration from the fluid level reaching the rotating components.
- Install the new OIL PAN (TOYOTA/LEXUS 1210131121), refill with the correct ATF quantity, start the engine and cycle through all selector positions P-R-N-D to prime the valve body passages, allow the transmission to reach operating temperature, recheck the ATF level on the dipstick at the correct operating temperature, confirm no pan gasket leaks after a 10-minute idle, road test confirming smooth shift quality at all speeds and loads, and recheck the ATF level after the first 500 km before returning the vehicle to service.
Tools: drain tray of adequate volume, plastic gasket scraper for housing face cleaning, brake cleaner and lint-free cloths, torque wrench (8–12 Nm) with extension for pan bolt access, correct ATF of exact OEM specification and service quantity, ATF thermometer for correct-temperature dipstick verification.
Frequently Asked Questions
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What is the correct service interval for automatic transmission pan and filter replacement, and does the "lifetime fill" designation change this?
The transmission pan with integrated filter should be replaced at every ATF service interval — the filter's capacity is sized for that interval's contamination load, and a filter that has been in service longer than its design life is restricting ATF flow to the pump inlet below the minimum required for adequate valve body hydraulic pressure. The OEM service interval is 40,000–80,000 km depending on the transmission and driving conditions; towing, urban stop-start driving, and spirited driving all accelerate filter loading and warrant the shorter end of this range. The "lifetime fill" designation means the transmission was factory-filled with fluid meeting the transmission's warranty requirements — it does not designate a filter that never requires replacement. Transmission engineers at every major manufacturer acknowledge that ATF and filter changes significantly extend transmission service life; the "lifetime" designation is a warranty claim, not a maintenance recommendation. ok.parts supplies automatic transmission oil pans with integrated filters at wholesale MOQ from 48.57 USD per unit.
Is ATF type specification critical for the transmission pan service, and what happens if the wrong fluid is used?
ATF specification is among the most critical fluid choices in the vehicle — using an incorrect type is more damaging than using the wrong engine oil grade. Each automatic transmission is designed around a specific friction modifier package in the ATF that determines how the clutch plates engage and release — the modifier controls engagement feel, clutch capacity, and wear rate. An incorrect fluid type causes clutch shudder from mismatched friction characteristics within the first drive cycle after service, accelerates clutch plate wear from inadequate boundary lubrication, and may cause seal swelling or shrinkage from incompatible seal conditioners. Always use the exact ATF specification printed on the transmission dipstick, on the pan itself, or in the OEM service data — never substitute based on viscosity grade or colour alone, and never mix ATF types even when topping up a partially filled system.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
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| Part | Reason for Combined Replacement |
|---|---|
| Automatic Transmission Fluid (ATF) OEM specification — service fill quantity | The pan and filter must always be replaced simultaneously with an ATF drain and refill — installing a new pan and filter in degraded ATF immediately begins loading the new filter with the existing contamination load; the new filter's service life is dramatically shortened because it must capture the entire contamination suspended in the old fluid from its first use. The reverse is equally true — draining and refilling ATF without replacing the loaded filter recirculates fresh fluid through a restriction that reduces hydraulic pressure from the first shift cycle. Always perform all three service items — pan, filter, and ATF — as a complete service operation. |
| Transmission Solenoid Valve Set Shift solenoids — OEM ref. varies by transmission | A filter that has been bypassing contaminated ATF from overload will have deposited metallic and friction material particles in the solenoid valve bores and on the solenoid plunger surfaces throughout the valve body. If shift quality does not fully restore to normal after a complete pan, filter, and ATF service on a transmission with known extended service history, the solenoid valves require cleaning or replacement — the filter replacement cannot undo the contamination that was deposited during the overdue service period. |
| Transmission External Cooler Flush ATF-to-coolant or ATF-to-air cooler — where fitted | The external transmission cooler and its connecting lines retain a volume of degraded ATF that is not drained when the pan is removed — typically 0.5–1.5 litres depending on the cooler size. This retained old ATF mixes with the fresh ATF on first startup, contaminating the new fluid and reloading the new filter with the degraded fluid's suspended particles. Flush the cooler circuit with fresh ATF simultaneously with the pan service by connecting a flushing machine or by hand-flushing through the cooler lines to ensure the complete circuit contains fresh fluid after the service. |